Critical-Severity Code Injection Flaw in fearlessgeekmedia FearlessCMS Tracked as CVE-2026-55695
A newly published critical vulnerability in fearlessgeekmedia FearlessCMS carries a CVSS score of 9.1. Here is what is affected and how to respond.
Key points
- CVE-2026-55695 affects fearlessgeekmedia FearlessCMS.
- CVSS 9.1 (Critical).
- No exploitation confirmed yet.
fearlessgeekmedia FearlessCMS is affected by CVE-2026-55695, a code injection that the National Vulnerability Database rates 9.1 out of 10.
At a glance
- CVE
- CVE-2026-55695
- Product
- fearlessgeekmedia FearlessCMS
- CVSS
- 9.1 Critical
- Weakness
- code injection
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: 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.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Fearlessgeekmedia | FearlessCMS | < 0.1.3b |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-55695
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-55695?
CVE-2026-55695 is a code injection vulnerability in fearlessgeekmedia FearlessCMS.
How severe is CVE-2026-55695?
It has a CVSS score of 9.1 Critical.
Is CVE-2026-55695 being exploited?
There is no public confirmation of exploitation at the time of publication.
