CVE-2026-40168: Postiz is an AI social media scheduling tool

Q: How do I fix CVE-2026-40168?

postiz: upgrade to 2.21.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-40168 being exploited?

CVE-2026-40168 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-2026-40168 affect?

CVE-2026-40168 affects postiz. Severity is high (CVSS 8.2). Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-val

Q: How urgent is CVE-2026-40168?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.2REMOTEUPGRADE

CVE-2026-40168 is a high-severity flaw (CVSS 8.2) 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 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-validate the final destination after HTTP redirects. As a result, an attacker can supply a public HTTPS URL that passes validation and then redirects the server-side request to an internal resource.

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	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-10
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-10 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

gitroom postiz UPGRADE

Affected: < 2.21.5

Fixed in: 2.21.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.21.5 (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-2026-40168?

postiz: upgrade to 2.21.5. Exact commands for each OS are on this page.

Is CVE-2026-40168 being exploited?

CVE-2026-40168 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-2026-40168 affect?

CVE-2026-40168 affects postiz. Severity is high (CVSS 8.2). Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-val

How urgent is CVE-2026-40168?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40487 HIGH 8.9 UPGRADE Postiz is an AI social media scheduling tool

References

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