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TI-2024-38438 Aliases CVE-2024-58354GHSA-hv2p-r28v-79q5

cal.com Repository Takeover via pull_request_target Workflow

Priority HIGH 72CWE-77Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
Low · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-77.

Summary

cal.com (calcom repository, later renamed cal.diy) is affected by a repository takeover vulnerability in its GitHub Actions workflows. The workflow pr.yml uses the pull_request_target trigger with the repository's default write permissions and passes them down to check-types.yml. check-types.yml then performs a 'dangerous' checkout of the attacker-submitted pull request code (via the dangerous-git-checkout action) and subsequently executes it (through yarn install and package.json scripts). An attacker can open a pull request whose code runs arbitrary commands with the repository's write-scoped GITHUB_TOKEN, allowing them to push commits, merge or mutate pull requests, add or delete comments, and delete or force-push branches, thereby compromising the repository. The main branch is affected; no patched version is available.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00485 41st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
calcomcal.diy——No fix listedCNA
  • cal.diy Vendorcalcom Affected — Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-58354
  2. 2026-10-03 Alias added: GHSA-hv2p-r28v-79q5

References

Patch 1

Advisory 1

  • TI-2024-38439 Cal.com through 4.7.15 Cross-Site Scripting via booking questions CVSS 4.0CRITICAL 9.3
  • TI-2024-38437 Cal.com through 4.7.15 Cross-Site Scripting via booking questions CVSS 4.0CRITICAL 9.3
  • TI-2026-08199 calcom cal.diy Generic React API bookings-single-view.getServerSideProps.tsx getServerSideProps information disclosure CVSS 4.0MEDIUM 6.9
  • TI-2023-19352 Cal.com not expiring old sessions after enabling 2FA CVSS 3.1MEDIUM 6.5
  • TI-2026-76231 Authorization bypass in cal.com and cal.diy webhook handler CVSS 4.0MEDIUM 5.3
  • TI-2026-71619 Improper privilege management in Cal.com credential deletion CVSS 4.0MEDIUM 5.3
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences