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Tool Directory

CVE-2026-42298

CriticalPublished

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

Published: May 8, 2026
Updated: May 11, 2026
Assigning CNA: GitHub_M
Evidence observed: Sep 7, 2026

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 42.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

gha-lab-677752506eResearch
Authorized security-research lab reproducing CVE-2026-42298 (pull_request_target docker-build RCE in pr-docker-build.yml) — flattened snapshot of gitroomhq/postiz-app

Responsible use

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