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CVE-2026-34577

Gitroom Postiz server-side request forgery (SSRF)

8.6 HIGHPublic exploitEPSS 0.53%
  1. Published2 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

Gitroom Postiz< 2.21.3

Remediation

Fixed in
Gitroom Postiz≥ 2.21.3

References

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Frequently asked

Is CVE-2026-34577 being actively exploited?

CVE-2026-34577 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.53%.

How severe is CVE-2026-34577?

CVE-2026-34577 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 0.53% probability of exploitation.

Which products are affected by CVE-2026-34577?

Affected products include Gitroom Postiz.

How do I fix CVE-2026-34577?

Upgrade affected software to a fixed version, for example Gitroom Postiz 2.21.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34577 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.