Every CVE Search/ Get API key

CVE-2026-53541

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

4.3 MediumFix available

OliveTin gives access to predefined shell commands from a web interface. The filterToDefinedArgumentsOnly function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, prior to commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d, a special case allows any argument whose name starts with ot_ to bypass this filter. While two system arguments (ot_executionTrackingId and ot_username) are injected by OliveTin and overridden, all other ot_-prefixed arguments supplied by the user pass through unmodified. These bypassed arguments are not type-checked — the validation loop only iterates over the action's defined arguments, so ot_-prefixed arguments skip all type safety checks entirely; set as environment variables — via buildEnv(), with completely unvalidated values, and passed to the executed command; and included in the template context — available as .Arguments.ot_* in template rendering. Commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d contains a patch.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.38%Up 0.2 points since Aug 22, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.3

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

OliveTin gives access to predefined shell commands from a web interface. The filterToDefinedArgumentsOnly function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, prior to commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d, a special case allows any argument whose name starts with ot_ to bypass this filter. While two system arguments (ot_executionTrackingId and ot_username) are injected by OliveTin and overridden, all other ot_-prefixed arguments supplied by the user pass through unmodified. These bypassed arguments are not type-checked — the validation loop only iterates over the action's defined arguments, so ot_-prefixed arguments skip all type safety checks entirely; set as environment variables — via buildEnv(), with completely unvalidated values, and passed to the executed command; and included in the template context — available as .Arguments.ot_* in template rendering. Commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d contains a patch.

Record
CVE-2026-53541
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-20
Updated
2026-11-02
EUVDEUVD-2026-64203 4.3

OliveTin gives access to predefined shell commands from a web interface. The filterToDefinedArgumentsOnly function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, prior to commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d, a special case allows any argument whose name starts with ot_ to bypass this filter. While two system arguments (ot_executionTrackingId and ot_username) are injected by OliveTin and overridden, all other ot_-prefixed arguments supplied by the user pass through unmodified. These bypassed arguments are not type-checked — the validation loop only iterates over the action's defined arguments, so ot_-prefixed arguments skip all type safety checks entirely; set as environment variables — via buildEnv(), with completely unvalidated values, and passed to the executed command; and included in the template context — available as .Arguments.ot_* in template rendering. Commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d contains a patch.

Record
EUVD-2026-64203
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-prj9-97mp-mwh2 4.3

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

Description

The filterToDefinedArgumentsOnly function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, a special case allows any argument whose name starts with ot_ to bypass this filter. While two system arguments (ot_executionTrackingId and ot_username) are injected by OliveTin and overridden, all other ot_-prefixed arguments supplied by the user pass through unmodified.

These bypassed arguments are:

  1. Not type-checked — the validation loop only iterates over the action's defined arguments, so ot_-prefixed arguments skip all type safety checks entirely.
  2. Set as environment variables — via buildEnv(), with completely unvalidated values, and passed to the executed command.
  3. Included in the template context — available as .Arguments.ot_* in template rendering.

Affected Code

Filter bypass — service/internal/executor/executor.go (lines 728–731):

func keepArgument(name string, definedNames map[string]struct{}) bool {
    _, ok := definedNames[name]
    return ok || strings.HasPrefix(name, "ot_")
}

System args only override two keys — service/internal/executor/executor.go (lines 742–745):

func injectSystemArgs(req *ExecutionRequest) {
    req.Arguments["ot_executionTrackingId"] = req.TrackingID
    req.Arguments["ot_username"] = req.AuthenticatedUser.Username
}

Any other ot_-prefixed argument (e.g., ot_malicious) survives both functions.

Unvalidated values become environment variables — service/internal/executor/executor.go (lines 867–882):

func buildEnv(args map[string]string) []string {
    ret := append(os.Environ(), "OLIVETIN=1")
    for k, v := range args {
        varName := fmt.Sprintf("%v", strings.TrimSpace(strings.ToUpper(k)))
        if varName == "" { continue }
        ret = append(ret, fmt.Sprintf("%v=%v", varName, v))
    }
    return ret
}

The value v is never validated. It can contain newlines, shell metacharacters, null bytes, or any arbitrary data.

Proof of Concept

An attacker sends a StartAction request with extra ot_-prefixed arguments:

{
  "bindingId": "<any-action-id>",
  "arguments": [
    { "name": "ot_custom_var", "value": "arbitrary unvalidated content \n with newlines" },
    { "name": "ot_another",    "value": "$(whoami)" }
  ]
}

These arguments:

  • Pass through filterToDefinedArgumentsOnly (the ot_ prefix exempts them).
  • Are never type-checked (not in the action's argument definitions).
  • Become environment variables OT_CUSTOM_VAR and OT_ANOTHER in the executed command's environment.
  • Are available in the template rendering context as .Arguments.ot_custom_var and .Arguments.ot_another.

Impact

  • Environment variable pollution — attacker can set arbitrary environment variables (with OT_ uppercased prefix) in the execution environment of any action they can trigger. Scripts or programs that read custom environment variables could be influenced.
  • Potential for secondary exploitation — if any executed script or command reads OT_-prefixed environment variables, the unvalidated content could cause unexpected behavior.
  • Template context pollution — although Go's text/template does not recursively evaluate data values (mitigating direct template injection), the extra arguments are accessible in the template context and could interact unexpectedly with custom template logic.

Suggested Fix

Remove the ot_ prefix exception from keepArgument, or restrict it to only the two known system arguments:

var systemArgs = map[string]struct{}{
    "ot_executionTrackingId": {},
    "ot_username":            {},
}

func keepArgument(name string, definedNames map[string]struct{}) bool {
    _, isDefined := definedNames[name]
    _, isSystem := systemArgs[name]
    return isDefined || isSystem
}

Discovery Methodology

Both vulnerabilities…

Record
GHSA-prj9-97mp-mwh2
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-20
Updated
2026-11-02
NVD 4.3

OliveTin gives access to predefined shell commands from a web interface. The filterToDefinedArgumentsOnly function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, prior to commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d, a special case allows any argument whose name starts with ot_ to bypass this filter. While two system arguments (ot_executionTrackingId and ot_username) are injected by OliveTin and overridden, all other ot_-prefixed arguments supplied by the user pass through unmodified. These bypassed arguments are not type-checked — the validation loop only iterates over the action's defined arguments, so ot_-prefixed arguments skip all type safety checks entirely; set as environment variables — via buildEnv(), with completely unvalidated values, and passed to the executed command; and included in the template context — available as .Arguments.ot_* in template rendering. Commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d contains a patch.

Record
CVE-2026-53541
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-20
Updated
2026-11-02
OSV 4.3

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

OliveTin gives access to predefined shell commands from a web interface. The filterToDefinedArgumentsOnly function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, prior to commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d, a special case allows any argument whose name starts with ot_ to bypass this filter. While two system arguments (ot_executionTrackingId and ot_username) are injected by OliveTin and overridden, all other ot_-prefixed arguments supplied by the user pass through unmodified. These bypassed arguments are not type-checked — the validation loop only iterates over the action's defined arguments, so ot_-prefixed arguments skip all type safety checks entirely; set as environment variables — via buildEnv(), with completely unvalidated values, and passed to the executed command; and included in the template context — available as .Arguments.ot_* in template rendering. Commit ebffd9f040f791208aee1db2e5a8aecd1e3e603d contains a patch.

Record
CVE-2026-53541
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-20
Updated
2026-11-02
OSVGHSA-prj9-97mp-mwh2 4.3

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering

Description

The filterToDefinedArgumentsOnly function in the executor is intended to discard any arguments not explicitly defined in the action's configuration. However, a special case allows any argument whose name starts with ot_ to bypass this filter. While two system arguments (ot_executionTrackingId and ot_username) are injected by OliveTin and overridden, all other ot_-prefixed arguments supplied by the user pass through unmodified.

These bypassed arguments are:

  1. Not type-checked — the validation loop only iterates over the action's defined arguments, so ot_-prefixed arguments skip all type safety checks entirely.
  2. Set as environment variables — via buildEnv(), with completely unvalidated values, and passed to the executed command.
  3. Included in the template context — available as .Arguments.ot_* in template rendering.

Affected Code

Filter bypass — service/internal/executor/executor.go (lines 728–731):

func keepArgument(name string, definedNames map[string]struct{}) bool {
    _, ok := definedNames[name]
    return ok || strings.HasPrefix(name, "ot_")
}

System args only override two keys — service/internal/executor/executor.go (lines 742–745):

func injectSystemArgs(req *ExecutionRequest) {
    req.Arguments["ot_executionTrackingId"] = req.TrackingID
    req.Arguments["ot_username"] = req.AuthenticatedUser.Username
}

Any other ot_-prefixed argument (e.g., ot_malicious) survives both functions.

Unvalidated values become environment variables — service/internal/executor/executor.go (lines 867–882):

func buildEnv(args map[string]string) []string {
    ret := append(os.Environ(), "OLIVETIN=1")
    for k, v := range args {
        varName := fmt.Sprintf("%v", strings.TrimSpace(strings.ToUpper(k)))
        if varName == "" { continue }
        ret = append(ret, fmt.Sprintf("%v=%v", varName, v))
    }
    return ret
}

The value v is never validated. It can contain newlines, shell metacharacters, null bytes, or any arbitrary data.

Proof of Concept

An attacker sends a StartAction request with extra ot_-prefixed arguments:

{
  "bindingId": "<any-action-id>",
  "arguments": [
    { "name": "ot_custom_var", "value": "arbitrary unvalidated content \n with newlines" },
    { "name": "ot_another",    "value": "$(whoami)" }
  ]
}

These arguments:

  • Pass through filterToDefinedArgumentsOnly (the ot_ prefix exempts them).
  • Are never type-checked (not in the action's argument definitions).
  • Become environment variables OT_CUSTOM_VAR and OT_ANOTHER in the executed command's environment.
  • Are available in the template rendering context as .Arguments.ot_custom_var and .Arguments.ot_another.

Impact

  • Environment variable pollution — attacker can set arbitrary environment variables (with OT_ uppercased prefix) in the execution environment of any action they can trigger. Scripts or programs that read custom environment variables could be influenced.
  • Potential for secondary exploitation — if any executed script or command reads OT_-prefixed environment variables, the unvalidated content could cause unexpected behavior.
  • Template context pollution — although Go's text/template does not recursively evaluate data values (mitigating direct template injection), the extra arguments are accessible in the template context and could interact unexpectedly with custom template logic.

Suggested Fix

Remove the ot_ prefix exception from keepArgument, or restrict it to only the two known system arguments:

var systemArgs = map[string]struct{}{
    "ot_executionTrackingId": {},
    "ot_username":            {},
}

func keepArgument(name string, definedNames map[string]struct{}) bool {
    _, isDefined := definedNames[name]
    _, isSystem := systemArgs[name]
    return isDefined || isSystem
}

Discovery Methodology

Both vulnerabilities…

Record
GHSA-prj9-97mp-mwh2
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-20
Updated
2026-11-02
OSVGO-2026-5552 No score

OliveTin has Unvalidated `ot_`-prefixed Arguments that Bypass Input Filtering in github.com/OliveTin/OliveTin

OliveTin has Unvalidated ot_-prefixed Arguments that Bypass Input Filtering in github.com/OliveTin/OliveTin

Record
GO-2026-5552
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/OliveTin/OliveTin
Go
 before 0.0.0-20260531214440-ebffd9f040f7
0.0.0-20260531214440-ebffd9f040f7
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-53541 is a medium vulnerability (CVSS 4.3) in Olivetin, published June 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 32nd percentile. Fixed in github.com/OliveTin/OliveTin 0.0.0-20260531214440-ebffd9f040f7.

References

Show 194 moreShow less
This page doesn't list everything

Left out here: 1,540 references and the rest of 3 source descriptions. The JSON record has them.

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open