CVE-2026-34577: Postiz is an AI social media scheduling tool

Q: How do I fix CVE-2026-34577?

postiz: upgrade to 2.21.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-34577 being exploited?

CVE-2026-34577 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34577 affect?

CVE-2026-34577 affects postiz. Severity is high (CVSS 8.6). 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 validatio

Q: How urgent is CVE-2026-34577?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.6REMOTEUPGRADE

CVE-2026-34577 is a high-severity flaw (CVSS 8.6) affecting postiz. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 unauthentic

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-02
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: gitroom

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 18:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

gitroom postiz UPGRADE

Affected: < 2.21.3

Fixed in: 2.21.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy postiz || rpm -q postiz || postiz --version

2. UPGRADE to 2.21.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade postiz

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade postiz

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34577?

postiz: upgrade to 2.21.3. Exact commands for each OS are on this page.

Is CVE-2026-34577 being exploited?

CVE-2026-34577 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34577 affect?

CVE-2026-34577 affects postiz. Severity is high (CVSS 8.6). 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 validatio

How urgent is CVE-2026-34577?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40168 HIGH 8.2 UPGRADE Postiz is an AI social media scheduling tool
CVE-2026-40487 HIGH 8.9 UPGRADE Postiz is an AI social media scheduling tool
CVE-2026-42298 CRITICAL 10.0 UPGRADE Postiz is an AI social media scheduling tool
CVE-2026-34576 HIGH 7.7 UPGRADE Postiz is an AI social media scheduling tool
CVE-2026-42556 HIGH 8.9 DOWNGRADE Postiz is an AI social media scheduling tool

References

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