CVE-2026-26351 GetSimpleCMS-CE < 3.3.22 Stored XSS via components.php
Authenticated administrators can inject persistent JavaScript via the component slug field, leading to session hijacking and administrative interface compromise.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-26351?
CVE-2026-26351 is a medium-severity cross-site scripting vulnerability in GetSimpleCMS-CE, published on 24 Feb 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-26351?
It affects 1 product.
Products include Getsimple-Ce Getsimple Cms.
How do I fix CVE-2026-26351?
No fix has been published for CVE-2026-26351 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-26351 being exploited?
There is no known exploitation of CVE-2026-26351 in the wild and no public exploit code.
Other vulnerabilities in GetSimpleCMS-CE
- CVE-2024-55085 Code injection in n/a
- CVE-2026-28495 GetSimple CMS has CSRF to Remote Code Execution via Arbitrary PHP Write in gsconfig.php
- CVE-2026-27202 GetSimple CMS: Uploaded Files (feature) Arbitrary File Read Vulnerability
- CVE-2024-55088 Server-side request forgery in n/a
- CVE-2026-27161 Unauthenticated Information Disclosure via .htaccess Reliance in Sensitive Directories
Sources
Also known as GHSA-95f7-vm92-8gpx, GHSA-98hq-gxg8-fchj.