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TI-2026-30607 Aliases CVE-2026-42298

Postiz: Arbitrary Code Execution and Token Exfiltration in pr-docker-build.yml via untrusted Dockerfile.dev

Priority MEDIUM 49CWE-94Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

Postiz is an AI social media scheduling tool. Prior to commit da44801, a "Pwn Request" vulnerability in the Build and Publish PR Docker Image workflow (.github/workflows/pr-docker-build.yml) allows any unauthenticated user to execute arbitrary code during the Docker build process and exfiltrate a highly privileged GITHUB_TOKEN (write-all permissions). This can be achieved simply by opening a Pull Request from a fork with a maliciously modified Dockerfile.dev. This issue has been patched via commit da44801.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00504 43rd 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
None
Automatable
Yes
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
gitroomhqpostiz-app< da448012dd87e94944cbe83a38e7fd023269ec46—No fix listedCNA
  • postiz-app Vendorgitroomhq Affected < da448012dd87e94944cbe83a38e7fd023269ec46 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*before 2.21.7Vulnerablegitroomhq
  • cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:* Versions before 2.21.7 Vulnerable ·gitroomhq

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42298
  2. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 1

Other 1

  • TI-2026-26825 Postiz: Unauthenticated Full-Read SSRF via /public/stream Endpoint with Trivially Bypassable Extension Check CVSS 3.1HIGH 8.6
  • TI-2026-28982 Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream CVSS 3.1HIGH 8.2
  • TI-2026-29238 Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS CVSS 3.1CRITICAL 9.0
  • TI-2026-26824 Postiz: SSRF in upload-from-url endpoint allows fetching internal resources and cloud metadata CVSS 4.0HIGH 8.3
  • TI-2026-26837 Postiz: SSRF via Webhook Creation Endpoint Missing URL Safety Validation CVSS 3.1MEDIUM 5.4
  • TI-2026-30836 Postiz stored XSS in public preview page CVSS 3.1CRITICAL 9.0

Sources

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