GetSimpleCMS Community Edition up to 3.3.16/3.3.21 components.php safe_slash_html slug cross site scripting

Summaryinfo

A vulnerability was found in GetSimpleCMS Community Edition up to 3.3.16/3.3.21 and classified as problematic. Affected by this issue is the function safe_slash_html of the file components.php. Executing a manipulation of the argument slug can lead to cross site scripting. This vulnerability is tracked as CVE-2026-26351. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in GetSimpleCMS Community Edition up to 3.3.16/3.3.21. It has been declared as problematic. This vulnerability affects the function safe_slash_html of the file components.php. The manipulation of the argument slug with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

GetSimpleCMS Community Edition (CE) versions prior to 3.3.22 (3.3.16 tested) contains a stored cross-site scripting (XSS) vulnerability in the Theme to Components functionality within components.php. User-supplied input provided to the "slug" field of a component is stored without proper output encoding. While other fields are sanitized using safe_slash_html(), the slug parameter is written to XML and later rendered in the administrative interface without sanitation, resulting in persistent execution of arbitrary JavaScript. An authenticated administrator can inject malicious script content that executes whenever the affected Components page is viewed by any authenticated user, enabling session hijacking, unauthorized administrative actions, and persistent compromise of the CMS administrative interface.

The weakness was disclosed by Beatriz Fresno Naumova as GHSA-95f7-vm92-8gpx. The advisory is available at github.com. This vulnerability was named CVE-2026-26351 since 02/13/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

By approaching the search of inurl:components.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 3.3.22 eliminates this vulnerability. The upgrade is hosted for download at github.com.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• GetSimpleCMS

Name

• Community Edition

Version

• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.3.5
• 3.3.6
• 3.3.7
• 3.3.8
• 3.3.9
• 3.3.10
• 3.3.11
• 3.3.12
• 3.3.13
• 3.3.14
• 3.3.15
• 3.3.16
• 3.3.17
• 3.3.18
• 3.3.19
• 3.3.20
• 3.3.21

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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