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CVE

CVE-2026-55378

JS Recon: Command injection in PR Branch Checker workflow via untrusted pull request context values
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CVE

CVE-2026-55378

JS Recon: Command injection in PR Branch Checker workflow via untrusted pull request context values

JS Recon is a JavaScript enumeration and SAST tool. From 1.2.1-beta.1 until 1.3.1-beta.2, the PR Branch Checker workflow in .github/workflows/prchecker.yml places github.headref and github.event.pullrequest.head.repo.fullname into BRANCHNAME and SOURCEREPO and interpolates those untrusted values into a shell gh pr comment command. A remote user who opens a pull request can use shell metacharacters in a branch or fork name to execute commands in the GitHub Actions runner with the workflow's GITHUB_TOKEN, which has pull-requests write permission. This issue is fixed in version 1.3.1-beta.2.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/js-recon/js-recon/releases/tag/v1.3.1-beta.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55378.json, https://github.com/js-recon/js-recon/security/advisories/GHSA-w9cj-mg3x-qjm4, https://nvd.nist.gov/vuln/detail/CVE-2026-55378, https://github.com/js-recon/js-recon/commit/447876c4bfa9ec5bc98cbc65d7a3e5f889412491, https://github.com/js-recon/js-recon/pull/121

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00849%
EPSS Percentile
0.56858%
Introduced Version
9d239baf051f35833503276ef5a5b2d33196a542
Fix Available
7470c2119339650bb798acf1247b594e17d4a214

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