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CVE-2026-55695— FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater

Quick assessment

Affected
fearlessgeekmedia FearlessCMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FearlessCMS 是一个以简洁性和开源为核心的扁平文件内容管理系统。在版本 0.1.2b 及更早版本中，经过身份验证的管理员可以通过 admin/updater-handler.php 设置任意 Git 仓库 URL，并触发 perform_update 操作。该操作会将此 URL 传递给 update.sh 脚本。更新器会克隆该 Git 仓库，并用其内容直接替换当前在线的 plugins/、admin/ 和 includes/ 目录，期间未对仓库的身份、签名或内容进行任何验证。由于 router.php 允

CVSS 9.1 · Critical EPSS 0.46% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
fearlessgeekmedia FearlessCMS < 0.1.3b affected
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I. Basic Information for CVE-2026-55695

Vulnerability Information
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Vulnerability Title
FearlessCMS: Remote Code Execution via Unvalidated Update Repository URL in System Updater
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
fearlessgeekmedia FearlessCMS < 0.1.3b -

II. Public POCs for CVE-2026-55695

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III. Intelligence Information for CVE-2026-55695

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Patches & Fixes for CVE-2026-55695 (3)

Vendor Advisories for CVE-2026-55695 (1)

IV. Related Vulnerabilities

Same weakness: CWE-94

V. Comments for CVE-2026-55695

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