Docker
CVE-2026-42298
CRITICAL
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Code injection prevention, sandbox exec
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv1 – Jul 24, 2026
Arbitrary code execution and privileged token theft affects Postiz (gitroomhq/postiz-app) prior to commit da44801 through an insecure GitHub Actions 'Pwn Request' pattern in the Build and Publish PR Docker Image workflow. Because the workflow triggers on pull_request_target with 'permissions: write-all' yet checks out and builds the untrusted fork head (Dockerfile.dev), any unauthenticated GitHub user can open a fork PR with a malicious Dockerfile.dev to run code on the runner and exfiltrate a write-all GITHUB_TOKEN, effectively hijacking the repository's CI/CD supply chain. Rated CVSS 10.0 with SSVC technical impact 'total' and automatable 'yes', but EPSS is low (0.14%) with no public exploit or KEV listing at time of analysis.
Affects your stack
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionNVD
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.
Executive ViewAI
Postiz (gitroomhq/postiz-app) contains a critical GitHub Actions workflow vulnerability allowing any unauthenticated user to execute arbitrary code and steal repository write privileges, enabling potential supply chain compromise through tainted releases. Organizations using Postiz face risk of malicious updates; maintainers face risk of repository and release pipeline hijacking.
Within 24 hours: verify Postiz deployment version and confirm whether you're affected (prior to commit da44801). Within 7 days: if using Postiz, pin to a known-good commit post-da44801 or disable automated updates; restrict GitHub Actions permissions on any internal projects using the pull_request_target pattern. Within 30 days: await vendor patch confirmation and upgrade immediately upon release; conduct supply chain audit of any Postiz releases or artifacts used in production.
No vendor-released patch identified at time of analysis. Interim mitigations: restrict GitHub Actions runner permissions to minimum required; use pull_request event instead of pull_request_target where possible; implement mandatory code review on all workflow file changes; monitor Actions audit logs for suspicious token exfiltration; implement branch protection requiring approval before merging fork PRs.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
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Exploit-DB