FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55695
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 16:17:22 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionFearlessCMS is a flat-file content management system centered on simplicity and open source. In 0.1.2b and earlier, an authenticated administrator can set an arbitrary Git repository URL through admin/updater-handler.php and trigger perform_update, which passes the URL to update.sh. The updater clones the repository and replaces the live plugins/, admin/, and includes/ directories without verifying the repository's identity, signatures, or contents. Because router.php permits existing PHP files under plugins to be executed by the PHP development server, attacker-supplied update content can execute arbitrary PHP with the web server process's privileges and persist as a backdoor. This issue is fixed in version 0.1.3b.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.004650000 probability, percentile 0.388490000 (date 2026-10-16)

Problem Types: CWE-94 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fearlessgeekmedia FearlessCMS affected < 0.1.3b Not specified

References

ReferenceSourceLinkTags
github.com/fearlessgeekmedia/FearlessCMS/commit/6dba91d496463e3940a2c917... [email protected] github.com
github.com/fearlessgeekmedia/FearlessCMS/pull/64 [email protected] github.com
github.com/fearlessgeekmedia/FearlessCMS/security/advisories/GHSA-56wm-3... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/fearlessgeekmedia/FearlessCMS/releases/tag/0.1.3 [email protected] github.com
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