Critical
Postiz: Arbitrary Code Execution and Token Exfiltration in pr-docker-build.yml via untrusted Dockerfile.dev
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-42298
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 20:12 UTC · Revision 1
Source evidence
Postiz: Arbitrary Code Execution and Token Exfiltration in pr-docker-build.yml via untrusted Dockerfile.dev
core-osv · Original sourcePublished 8 May 2026, 22:24 UTC
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.
osv:CVE-2026-42298
Complete source record
{
"id": "d19b1bd9bcde4df2a8a5460fcbf9cdafdeabdeacf54b2f44b32a16e29a3d745c",
"url": "https://osv.dev/vulnerability/CVE-2026-42298",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Postiz: Arbitrary Code Execution and Token Exfiltration in pr-docker-build.yml via untrusted Dockerfile.dev",
"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.",
"evidence": "osv:CVE-2026-42298",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-42298",
"aliases": [
"CVE-2026-42298",
"GHSA-v975-9h5p-xhm4"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/gitroomhq/postiz-app",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "7236213ea4520bd67b45688c2787d1f4586b3b51"
},
{
"fixed": "da448012dd87e94944cbe83a38e7fd023269ec46"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.21.7"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "da448012dd87e94944cbe83a38e7fd023269ec46"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2.21.6",
"v2.21.5",
"v2.21.3",
"v2.21.2",
"v2.21.1",
"v2.21.0",
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"v1.39.2",
"v1.38.2",
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"v1.37.4",
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"1.6.0",
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"v1.1.0",
"v1.0.0",
"v0.0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42298.json"
}
}
],
"modified": "2026-10-28T02:30:39.076496996Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42298.json",
"https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-v975-9h5p-xhm4",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42298",
"https://github.com/gitroomhq/postiz-app/commit/da448012dd87e94944cbe83a38e7fd023269ec46"
],
"provider_metadata": {
"cwe_ids": [
"CWE-94"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42298.json"
}
},
"related_cves": [
{
"value": "CVE-2026-42298",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 506541,
"published_at": "2026-05-08T22:24:10.249+00:00"
}