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

Type: advisorySource: Official CVE List1 source record

FearlessCMS 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.

Announced Source revision 1
Original source ↗

CVE-2026-55695

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-55695

FearlessCMS

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "fearlessgeekmedia",
    "product": "FearlessCMS",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.1.3b"
      }
    ]
  }
]
Related CVEs
CVE-2026-55695

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#20369 · Revision 1
Added to Heist Feed
Publisher date
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