CVE-2021-47931 Exponent CMS 2.6 Multiple Vulnerabilities Stored XSS Authentication
Authenticated attackers can inject malicious scripts via text editing parameters in Exponent CMS, leading to arbitrary JavaScript execution and potential data exposure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-47931?
CVE-2021-47931 is a medium-severity cross-site scripting vulnerability in Exponentcms Exponent CMS, published on 10 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Exponent CMS 2.6 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject malicious scripts through the Title and Text Block parameters in the text editing endpoint. Attackers can inject iframe payloads with embedded SVG onload events to execute arbitrary JavaScript. The application also exposes database credentials in responses and lacks brute-force protection on authentication endpoints.
Weakness: CWE-79
Which versions are affected by CVE-2021-47931?
How do I fix CVE-2021-47931?
No fix has been published for CVE-2021-47931 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-2021-47931 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47931 exists.
Sources
Also known as GHSA-6jxm-mv8c-gh34.