Every CVE Search/ Get API key

CVE-2026-45089

Dalfox: Unauthenticated Arbitrary File Create/Append via `output` Option in Dalfox Server Mode

8.2 HighFix available

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem. 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
None
Integrity
High
Availability
Low

Exploit likelihood

0.24%Up 0.2 points since May 28, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

Dalfox: Unauthenticated Arbitrary File Create/Append via `output` Option 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 run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem. This vulnerability is fixed in 2.13.0.

Record
CVE-2026-45089
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Weakness
CWE-73, CWE-306, CWE-434
Updated
2026-11-02
EUVDEUVD-2026-32614 8.2

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem. This vulnerability is fixed in 2.13.0.

Record
EUVD-2026-32614
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-8hf9-3q64-q2qf 8.2

Dalfox Server Mode has an Unauthenticated Arbitrary File Create/Append via `output` Option

Summary

When dalfox is run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem.

Severity

High (CVSS 3.1: 8.2)

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

  • Attack Vector: Network — server binds to 0.0.0.0:6664 by default.
  • Attack Complexity: Low — no preconditions; all trigger options (output, output-all, debug) are fully attacker-supplied in the JSON body.
  • Privileges Required: None — --api-key defaults to "", so the auth middleware is never registered.
  • User Interaction: None.
  • Scope: Unchanged — the file write stays within the dalfox process's OS authority.
  • Confidentiality Impact: None — this is a write-only primitive; no data is returned to the caller.
  • Integrity Impact: High — the attacker has full control over which file path is opened, enabling creation of new files or corruption of existing files anywhere the dalfox process has write permission. While the log content format is semi-fixed, the file path is entirely attacker-determined, making the integrity violation complete with respect to file targeting.
  • Availability Impact: Low — corrupting application configuration files or log files on the host can degrade the availability of other services relying on those files.

Affected Component

  • cmd/server.go — init() (line 51): --api-key defaults to "" — no auth by default
  • pkg/server/server.go — setupEchoServer() (line 68): auth middleware only registered when APIKey != ""
  • pkg/server/server.go — postScanHandler() (lines 173–191): rq.Options (including OutputFile, OutputAll, Debug) passed to ScanFromAPI without sanitization
  • lib/func.go — Initialize() (line 107): OutputFile explicitly propagated from caller options; OutputAll (line 167) and Debug (line 176) likewise
  • internal/printing/logger.go — DalLog() (lines 230–244): os.OpenFile(options.OutputFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644) executes outside the IsLibrary guard

CWE

  • CWE-306: Missing Authentication for Critical Function
  • CWE-73: External Control of File Name or Path
  • CWE-434: Unrestricted Upload of File with Dangerous Type (write-path variant)

Description

output, output-all, and debug Are Fully Attacker-Controlled

model.Options exposes all three trigger fields with JSON tags:

// pkg/model/options.go:88,85,88
OutputFile  string `json:"output,omitempty"`
OutputAll   bool   `json:"output-all,omitempty"`
Debug       bool   `json:"debug,omitempty"`

postScanHandler binds the entire Req.Options from the JSON body and passes it directly to ScanFromAPI:

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

Initialize explicitly copies all three fields into newOptions:

// lib/func.go:107, 167, 176
"OutputFile": {&newOptions.OutputFile, options.OutputFile},
...
"OutputAll":  {&newOptions.OutputAll, options.OutputAll},
...
"Debug":      {&newOptions.Debug, options.Debug},

The File Write Is Not Guarded by IsLibrary

Initialize always sets IsLibrary: true (line 20) and Silence: true (line 44) in its returned options — the intent being that the scan engine runs in…

Record
GHSA-8hf9-3q64-q2qf
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Weakness
CWE-73, CWE-306, CWE-434
Updated
2026-11-02
NVD 8.2

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem. This vulnerability is fixed in 2.13.0.

Record
CVE-2026-45089
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Weakness
CWE-73, CWE-306, CWE-434
Updated
2026-11-02
OSV 8.2

Dalfox: Unauthenticated Arbitrary File Create/Append via `output` Option 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 run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem. This vulnerability is fixed in 2.13.0.

Record
CVE-2026-45089
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Weakness
CWE-306, CWE-434, CWE-73
Updated
2026-11-02
OSVGHSA-8hf9-3q64-q2qf 8.2

Dalfox Server Mode has an Unauthenticated Arbitrary File Create/Append via `output` Option

Summary

When dalfox is run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem.

Severity

High (CVSS 3.1: 8.2)

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

  • Attack Vector: Network — server binds to 0.0.0.0:6664 by default.
  • Attack Complexity: Low — no preconditions; all trigger options (output, output-all, debug) are fully attacker-supplied in the JSON body.
  • Privileges Required: None — --api-key defaults to "", so the auth middleware is never registered.
  • User Interaction: None.
  • Scope: Unchanged — the file write stays within the dalfox process's OS authority.
  • Confidentiality Impact: None — this is a write-only primitive; no data is returned to the caller.
  • Integrity Impact: High — the attacker has full control over which file path is opened, enabling creation of new files or corruption of existing files anywhere the dalfox process has write permission. While the log content format is semi-fixed, the file path is entirely attacker-determined, making the integrity violation complete with respect to file targeting.
  • Availability Impact: Low — corrupting application configuration files or log files on the host can degrade the availability of other services relying on those files.

Affected Component

  • cmd/server.go — init() (line 51): --api-key defaults to "" — no auth by default
  • pkg/server/server.go — setupEchoServer() (line 68): auth middleware only registered when APIKey != ""
  • pkg/server/server.go — postScanHandler() (lines 173–191): rq.Options (including OutputFile, OutputAll, Debug) passed to ScanFromAPI without sanitization
  • lib/func.go — Initialize() (line 107): OutputFile explicitly propagated from caller options; OutputAll (line 167) and Debug (line 176) likewise
  • internal/printing/logger.go — DalLog() (lines 230–244): os.OpenFile(options.OutputFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644) executes outside the IsLibrary guard

CWE

  • CWE-306: Missing Authentication for Critical Function
  • CWE-73: External Control of File Name or Path
  • CWE-434: Unrestricted Upload of File with Dangerous Type (write-path variant)

Description

output, output-all, and debug Are Fully Attacker-Controlled

model.Options exposes all three trigger fields with JSON tags:

// pkg/model/options.go:88,85,88
OutputFile  string `json:"output,omitempty"`
OutputAll   bool   `json:"output-all,omitempty"`
Debug       bool   `json:"debug,omitempty"`

postScanHandler binds the entire Req.Options from the JSON body and passes it directly to ScanFromAPI:

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

Initialize explicitly copies all three fields into newOptions:

// lib/func.go:107, 167, 176
"OutputFile": {&newOptions.OutputFile, options.OutputFile},
...
"OutputAll":  {&newOptions.OutputAll, options.OutputAll},
...
"Debug":      {&newOptions.Debug, options.Debug},

The File Write Is Not Guarded by IsLibrary

Initialize always sets IsLibrary: true (line 20) and Silence: true (line 44) in its returned options — the intent being that the scan engine runs in…

Record
GHSA-8hf9-3q64-q2qf
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Weakness
CWE-306, CWE-434, CWE-73
Updated
2026-11-02
OSVGO-2026-5257 No score

Dalfox Server Mode has an Unauthenticated Arbitrary File Create/Append via `output` Option in github.com/hahwul/dalfox

Dalfox Server Mode has an Unauthenticated Arbitrary File Create/Append via output Option in github.com/hahwul/dalfox

Record
GO-2026-5257
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

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-2026-45089 is a high vulnerability (CVSS 8.2) in Hahwul Dalfox, published May 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. Fixed in github.com/hahwul/dalfox/v2 2.13.0.

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