Detections
Analytics

SCA: security update for @tinacms/app, tinacms (GHSA-g5qx-h5f3-mp2f)

high Tenable Cloud Security Plugin ID 443727

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3,
 cross-origin postMessage handlers and a rich-text URL-sanitization bypass enable stored XSS and session
 takeover. The library registers window message listeners — the useTina overlay handler, the OAuth
 authentication popup handler, and the admin↔preview iframe GraphQL reducer — that act on event.data
 without verifying event.origin or event.source and post messages using non-specific target origins, while
 insufficient URL sanitization in rich-text content allows malicious URLs to persist and execute. A page
 the victim visits (or a window in an opener/iframe relationship with a Tina admin) can forge messages to
 drive the editor, inject preview content, or observe/forge the OAuth popup channel to take over an
 authenticated editing session. This issue has been fixed in versions @tinacms/app 2.5.6 and tinacms 3.9.3.
 (CVE-2026-55660)

Solution

Update the @tinacms/app library and its related packages to version 2.5.6 or later.

See Also

https://github.com/advisories/GHSA-g5qx-h5f3-mp2f

Plugin Details

Severity: High

ID: 443727

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 6/20/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.48

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-55660

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.6

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/19/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-55660