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CVE Vulnerability Details :
CVE-2026-42346
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-08 May, 2026 | 22:26
Updated At-08 May, 2026 | 22:26
Rejected At-
▼CVE Numbering Authority (CNA)
Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validation paths

Postiz is an AI social media scheduling tool. From version 2.16.6 to before version 2.21.7, all SSRF protections added in v2.21.4–v2.21.6 share a fundamental TOCTOU (Time-of-Check-Time-of-Use) vulnerability: isSafePublicHttpsUrl() resolves DNS to validate the target IP, but subsequent fetch() calls resolve DNS independently. An attacker controlling a DNS server can exploit this gap via DNS rebinding to redirect requests to internal network addresses. This issue has been patched in version 2.21.7.

Affected Products
Vendor
gitroomhq
Product
postiz-app
Versions
Affected
  • >= 2.16.6, < 2.21.7
Problem Types
TypeCWE IDDescription
CWECWE-918CWE-918: Server-Side Request Forgery (SSRF)
Type: CWE
CWE ID: CWE-918
Description: CWE-918: Server-Side Request Forgery (SSRF)
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45
x_refsource_CONFIRM
https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb
x_refsource_MISC
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7
x_refsource_MISC
Hyperlink: https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb
Resource:
x_refsource_MISC
Hyperlink: https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7
Resource:
x_refsource_MISC
Details not found