Critical severity · published May 8, 2026
CVE-2026-42298
Postiz: Arbitrary Code Execution and Token Exfiltration in pr-docker-build.yml via untrusted Dockerfile.dev
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
postiz-app · gitroomhq
< da448012dd87e94944cbe83a38e7fd023269ec46 · source: vendor
PO
Postiz · Gitroom
before 2.21.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42298
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42298
URL Repurposed
https://github.com/gitroomhq/postiz-app/commit/da448012dd87e94944cbe83a38e7fd023269ec46
Vendor Advisory
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-v975-9h5p-xhm4
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