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CVE-2026-45087

Dalfox: Unauthenticated Remote Code Execution via `found-action` in Dalfox Server Mode

10.0 CriticalPublic exploitFix available

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered. This vulnerability is fixed in 2.13.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

8.73%Up 8.7 points since May 28, 2026
90%50%10%1%

What each source reports

CVE List Score used 10.0

Dalfox: Unauthenticated Remote Code Execution via `found-action` in Dalfox Server Mode

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered. This vulnerability is fixed in 2.13.0.

Record
CVE-2026-45087
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-15, CWE-78, CWE-306
Updated
2026-11-02
EUVDEUVD-2026-32615 10.0

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered. This vulnerability is fixed in 2.13.0.

Record
EUVD-2026-32615
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-v25v-m36w-jp4h 10.0

Dalfox Server Mode Vulnerable to Unauthenticated Remote Code Execution via `found-action`

GHSA: Unauthenticated Remote Code Execution via found-action in Dalfox Server Mode

Summary

When dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered.

Severity

Critical (CVSS 3.1: 10.0)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

  • Attack Vector: Network — the server binds to 0.0.0.0 by default; reachable by any network peer.
  • Attack Complexity: Low — the attacker fully controls the scanned URL and can trivially host a one-line reflective server to guarantee a finding is triggered.
  • Privileges Required: None — no API key is enforced in the default configuration.
  • User Interaction: None.
  • Scope: Changed — exploitation escapes the dalfox process boundary and executes arbitrary commands on the host OS.
  • Confidentiality Impact: High — full read access to the host filesystem and secrets in the process environment.
  • Integrity Impact: High — arbitrary file writes, code deployment, persistence mechanisms.
  • Availability Impact: High — process kill, resource exhaustion, service disruption.

Affected Component

  • cmd/server.go — init() (line 51): --api-key defaults to ""
  • pkg/server/server.go — setupEchoServer() (line 68): auth middleware only registered when APIKey != ""
  • pkg/server/server.go — postScanHandler() (lines 173–191): rq.Options passed to ScanFromAPI without sanitization
  • lib/func.go — Initialize() (lines 118–119): FoundAction / FoundActionShell explicitly propagated from caller options
  • pkg/scanning/foundaction.go — foundAction() (lines 17–18): exec.Command(options.FoundActionShell, "-c", afterCmd) executed unconditionally

CWE

  • CWE-306: Missing Authentication for Critical Function
  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • CWE-15: External Control of System or Configuration Setting

Description

Opt-in Authentication with a Dangerous Default

cmd/server.go registers the --api-key flag with an empty string default:

// cmd/server.go:51
serverCmd.Flags().StringVar(&apiKey, "api-key", "", "Specify the API key for server authentication...")

setupEchoServer only installs the apiKeyAuth middleware when that value is non-empty:

// pkg/server/server.go:68-70
if options.ServerType == "rest" && options.APIKey != "" {
    e.Use(apiKeyAuth(options.APIKey, options))
}

A server started without --api-key accepts every request on every route with no challenge. The apiKeyAuth implementation itself is correct — the flaw is purely in the opt-in condition that makes authentication off by default.

Attacker-Controlled Options Reaches Shell Execution Without Stripping

POST /scan deserializes the full model.Options struct from the JSON body:

// pkg/server/model.go:6-8
type Req struct {
    URL     string        `json:"url"`
    Options model.Options `json:"options"`
}

// pkg/server/server.go:173-191
rq := new(Req)
if err := c.Bind(rq); err != nil { ... }
go ScanFromAPI(rq.URL, rq.Options, *options, sid)

model.Options exposes both execution-control fields as JSON-tagged properties:

// pkg/model/options.go:83-84
FoundAction      string `json:"found-action,omitempty"`
FoundActionShell string `json:"found-action-shell,omitempty"`

ScanFromAPI builds the scan target directly from…

Record
GHSA-v25v-m36w-jp4h
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-15, CWE-78, CWE-306
Updated
2026-11-02
NVD 10.0

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered. This vulnerability is fixed in 2.13.0.

Record
CVE-2026-45087
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-15, CWE-78, CWE-306
Updated
2026-11-02
OSV 10.0

Dalfox: Unauthenticated Remote Code Execution via `found-action` in Dalfox Server Mode

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered. This vulnerability is fixed in 2.13.0.

Record
CVE-2026-45087
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-15, CWE-306, CWE-78
Updated
2026-11-02
OSVGHSA-v25v-m36w-jp4h 10.0

Dalfox Server Mode Vulnerable to Unauthenticated Remote Code Execution via `found-action`

GHSA: Unauthenticated Remote Code Execution via found-action in Dalfox Server Mode

Summary

When dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered.

Severity

Critical (CVSS 3.1: 10.0)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

  • Attack Vector: Network — the server binds to 0.0.0.0 by default; reachable by any network peer.
  • Attack Complexity: Low — the attacker fully controls the scanned URL and can trivially host a one-line reflective server to guarantee a finding is triggered.
  • Privileges Required: None — no API key is enforced in the default configuration.
  • User Interaction: None.
  • Scope: Changed — exploitation escapes the dalfox process boundary and executes arbitrary commands on the host OS.
  • Confidentiality Impact: High — full read access to the host filesystem and secrets in the process environment.
  • Integrity Impact: High — arbitrary file writes, code deployment, persistence mechanisms.
  • Availability Impact: High — process kill, resource exhaustion, service disruption.

Affected Component

  • cmd/server.go — init() (line 51): --api-key defaults to ""
  • pkg/server/server.go — setupEchoServer() (line 68): auth middleware only registered when APIKey != ""
  • pkg/server/server.go — postScanHandler() (lines 173–191): rq.Options passed to ScanFromAPI without sanitization
  • lib/func.go — Initialize() (lines 118–119): FoundAction / FoundActionShell explicitly propagated from caller options
  • pkg/scanning/foundaction.go — foundAction() (lines 17–18): exec.Command(options.FoundActionShell, "-c", afterCmd) executed unconditionally

CWE

  • CWE-306: Missing Authentication for Critical Function
  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • CWE-15: External Control of System or Configuration Setting

Description

Opt-in Authentication with a Dangerous Default

cmd/server.go registers the --api-key flag with an empty string default:

// cmd/server.go:51
serverCmd.Flags().StringVar(&apiKey, "api-key", "", "Specify the API key for server authentication...")

setupEchoServer only installs the apiKeyAuth middleware when that value is non-empty:

// pkg/server/server.go:68-70
if options.ServerType == "rest" && options.APIKey != "" {
    e.Use(apiKeyAuth(options.APIKey, options))
}

A server started without --api-key accepts every request on every route with no challenge. The apiKeyAuth implementation itself is correct — the flaw is purely in the opt-in condition that makes authentication off by default.

Attacker-Controlled Options Reaches Shell Execution Without Stripping

POST /scan deserializes the full model.Options struct from the JSON body:

// pkg/server/model.go:6-8
type Req struct {
    URL     string        `json:"url"`
    Options model.Options `json:"options"`
}

// pkg/server/server.go:173-191
rq := new(Req)
if err := c.Bind(rq); err != nil { ... }
go ScanFromAPI(rq.URL, rq.Options, *options, sid)

model.Options exposes both execution-control fields as JSON-tagged properties:

// pkg/model/options.go:83-84
FoundAction      string `json:"found-action,omitempty"`
FoundActionShell string `json:"found-action-shell,omitempty"`

ScanFromAPI builds the scan target directly from…

Record
GHSA-v25v-m36w-jp4h
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-15, CWE-306, CWE-78
Updated
2026-11-02
OSVGO-2026-5649 No score

Dalfox Server Mode Vulnerable to Unauthenticated Remote Code Execution via `found-action` in github.com/hahwul/dalfox

Dalfox Server Mode Vulnerable to Unauthenticated Remote Code Execution via found-action in github.com/hahwul/dalfox

Record
GO-2026-5649
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/hahwul/dalfox/v2
Go
 through 2.12.0
2.13.0
github.com/hahwul/dalfox/v2
Go
 before 2.13.0
2.13.0
github.com/hahwul/dalfox
Go
 All versions None known
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

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
MetasploitDalfox Found-Action Deserialization RCE2026-05-07

History

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

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

In short

CVE-2026-45087 is a critical vulnerability (CVSS 10.0) in Hahwul Dalfox, published May 12, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 8.73%, the 95th percentile. Fixed in github.com/hahwul/dalfox/v2 2.13.0.

References

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