CVE-2026-108261 TinaCMS - Broken Access Control

TinaCMS < 3.14.0 and @tinacms/app < 2.5.14 contain a broken access control vulnerability caused by improper origin validation in admin preview routing, letting unauthenticated attackers trick signed-in editors into executing GraphQL operations with their credentials.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Published
9 October 2026
Updated
15 October 2026
Weakness
CWE-346

Vendor fix

Update to tinacms 3.14.0 and @tinacms/app 2.5.14 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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