CVE-2026-40168: Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream
Vulnerability summary
CVE-2026-40168 is a high (CVSS 8.2) Server-Side Request Forgery (SSRF) vulnerability in gitroom postiz. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 42.9% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 10-04-2026PublishedVulnerability first disclosed.
- 13-04-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST8.2HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
EPSS trend
Probability
0.52%
Chance of exploitation in the next 30 days
Percentile
43%
Versus all other CVEs
30-day change
Increase +0.14 pp
From 0.37% on 23-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundPostiz App
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Gitroom1 product
- postiz< 2.21.5
Gitroomhq1 product
- postiz-app< 2.21.5
2 vendors · 2 products
References
3 links- github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6wwX Refsource CONFIRMExploitMitigationVendor Advisory
- github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d1b46d83ad616cb06X Refsource MISCPatch