VDB-362395 · CVE-2026-42346 · GHSA-f7jj-p389-4w45

gitroomhq postiz-app up to 2.21.6 isSafePublicHttpsUrl server-side request forgery

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5.9	$0-$5k	0.00

Summaryinfo

A vulnerability was found in gitroomhq postiz-app up to 2.21.6. It has been classified as critical. Affected by this vulnerability is the function isSafePublicHttpsUrl. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-42346. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in gitroomhq postiz-app up to 2.21.6. Affected by this vulnerability is the function isSafePublicHttpsUrl. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-42346 since 04/26/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.21.7 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

gitroomhq

Name

postiz-app

Version

License

open-source

Website

Product: https://github.com/gitroomhq/postiz-app/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Server-side request forgery
CWE: CWE-918
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: postiz-app 2.21.7
Patch: 071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb

Timelineinfo

04/26/2026 CVE reserved
05/09/2026 +13 days Advisory disclosed
05/09/2026 +0 days VulDB entry created
05/09/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-f7jj-p389-4w45
Status: Confirmed

CVE: CVE-2026-42346 (🔒)
GCVE (CVE): GCVE-0-2026-42346
GCVE (VulDB): GCVE-100-362395

Entryinfo

Created: 05/09/2026 06:59
Changes: 05/09/2026 06:59 (68)
Complete: 🔍
Cache ID: 216::103