EUVD-2026-53575Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Remote fork PR plus @claude comment needs no privileges or maintainer interaction (PR:N/UI:N/AC:L), and runner code escapes to abuse a privileged token (S:C, C/I/A:H).
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionCVE.org
PraisonAI is a multi-agent teams system. In versions prior to 4.6.40, the bundled Claude GitHub Actions workflow is vulnerable to command injection because it embeds an attacker-controlled pull request branch name into a Bash run: block without quoting or validation. Additionally, the workflow allows any @claude comment to trigger the job regardless of whether the commenter is a trusted collaborator. An outside contributor can open a pull request from a fork whose branch name contains shell metacharacters and comment @claude, causing Bash to execute arbitrary shell code in the GitHub Actions runner. Because these commands run in a job holding a GitHub App token with write permissions, OIDC access, and gh/git access, the injection can be chained through $GITHUB_PATH to compromise later privileged steps, enabling repository writes, pull request and issue manipulation, or OIDC-token abuse. This issue has been fixed in version 4.6.40.
AnalysisAI
Unauthenticated remote command execution in PraisonAI's bundled Claude GitHub Actions workflow (versions before 4.6.40) lets an outside contributor run arbitrary shell code on the CI runner by opening a fork pull request whose branch name contains shell metacharacters and posting an @claude comment. Two compounding flaws enable this: the workflow interpolates the attacker-controlled branch name directly into an unquoted Bash run: block, and it triggers for any @claude comment without verifying the commenter is a trusted collaborator. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires that the target repository has deployed the bundled Claude GitHub Actions workflow (.github/workflows/claude.yml) from a pre-4.6.40 release, configured with a GitHub App token carrying write permissions plus OIDC and gh/git access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue rather than an inflated high-CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to PraisonAI 4.6.40, which quotes the branch name via environment variables in the workflow's Bash block. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: immediately audit all GitHub Actions workflows in your repositories to identify and disable PraisonAI's Claude workflow (any version before 4.6.40), or restrict it to explicitly trusted collaborators only while disabling branch-triggered execution from external forks. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Command Injection
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External POC / Exploit Code
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