CVE-2026-2987 Simple Ajax Chat <= 20260217 - Unauthenticated Stored Cross-Site Scripting via 'c'
Unauthenticated attackers can inject arbitrary scripts via the 'c' parameter, leading to script execution when users view the page.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-2987?
CVE-2026-2987 is a medium-severity cross-site scripting vulnerability in specialk Simple Ajax Chat – Add a Fast, Secure Chat Box, published on 12 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Simple Ajax Chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'c' parameter in versions up to, and including, 20260217 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-2987?
How do I fix CVE-2026-2987?
No fix has been published for CVE-2026-2987 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-2026-2987 being exploited?
There is no known exploitation of CVE-2026-2987 in the wild and no public exploit code.
Sources
Also known as GHSA-ppcm-cqr4-pgxg.