CVE-2026-110907

Backdrop CMS Core Token Browser Access Control Bypass

Published Oct 15, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Backdrop CMS Core 1.35.x before 1.35.2 and 1.34.x before 1.34.6 mishandles tokens. A token is a small placeholder string (like [node:title] or [user:name]) used to automatically insert dynamic data into text. A browser is provided for selecting tokens by type. The product doesn't sufficiently limit access to the types of tokens that are available in the token browser. The names of the individual tokens are adequately protected.

Remediation

Vendor Solution

Update your site to the most recent version of Backdrop core. Download available on the Backdrop CMS 1.35.2 release page https://github.com/backdrop/backdrop/releases/tag/1.35.2 . See the update instructions https://docs.backdropcms.org/documentation/core-updates .

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Backdrop CMS Core Token Browser Access Control Bypass
Type Values Removed Values Added
Description Backdrop CMS Core 1.35.x before 1.35.2 and 1.34.x before 1.34.6 mishandles tokens. A token is a small placeholder string (like [node:title] or [user:name]) used to automatically insert dynamic data into text. A browser is provided for selecting tokens by type. The product doesn't sufficiently limit access to the types of tokens that are available in the token browser. The names of the individual tokens are adequately protected.
First Time appeared Backdropcms
Backdropcms backdrop
Weaknesses CWE-669
CPEs cpe:2.3:a:backdropcms:backdrop:*:*:*:*:*:*:*:*
Vendors & Products Backdropcms
Backdropcms backdrop
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 19, 2026, 6:42 PM
Reserved
Oct 15, 2026, 2:09 AM
Status
Awaiting Analysis
Published
Oct 15, 2026, 3:17 AM
Modified
Oct 19, 2026, 7:17 PM