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Public proof of conceptFix available

CVE-2026-34577

A public proof of concept exists; no exploitation attested.

  • Published2026-04-02
  • Fixed in2.21.3
  • WeaknessCWE-918

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.

Timeline

dates in UTC
  1. 2026-11-1204:48Nuclei detection templateProjectDiscovery

Versions per branch

NVD
Gitroom postiz
BranchAffectedFixed in
2.21< 2.21.32.21.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • gitroomhq postiz-app
    Affected
    • = < 2.21.3no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-02

Fix

  1. Update Gitroom postiz to 2.21.3

Advisories and patches

Detection

read 2026-11-12 10:22 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-04-03
  • CNACVSS 3.18.6known since 2026-10-23
  • CNAweakness (CWE)CWE-918known since 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-11-12
  • ProjectDiscoverydetectionread 2026-11-12

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Published
2026-04-02
Last Modified
2026-07-24
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-34577?

Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.

Is CVE-2026-34577 actively exploited?

A proof-of-concept exploit exists for CVE-2026-34577, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-34577?

CVE-2026-34577 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

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