ByteOS Network

NVD Vulnerability Details :

CVE-2026-42346

Received

Source-security-advisories@github.com

Published At-08 May, 2026 | 23:16

Updated At-08 May, 2026 | 23:16

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	6.5	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Type: Secondary

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

Weaknesses

CWE ID	Type	Source
CWE-918	Primary	security-advisories@github.com

CWE ID: CWE-918

Type: Primary

Source: security-advisories@github.com

References

Hyperlink	Source	Resource
https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb	security-advisories@github.com	N/A
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7	security-advisories@github.com	N/A
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45	security-advisories@github.com	N/A