CVE-2026-84829 Optimole < 4.2.12 - Unauthenticated Stored XSS via Srcset Descriptor Parameter
Unauthenticated attackers can inject arbitrary scripts into pages via the srcset descriptor parameter, affecting all visitors of sites using the Optimole plugin.
- 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-2026-84829?
CVE-2026-84829 is a high-severity cross-site scripting vulnerability in Unknown Optimole, published on 16 Sep 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 Optimole WordPress plugin before 4.2.12 does not properly escape a user supplied value before using it to build an image tag attribute, allowing unauthenticated users to inject arbitrary attributes into pages served to every visitor, which leads to Stored Cross-Site Scripting.
Weakness: CWE-79
Which versions are affected by CVE-2026-84829?
How do I fix CVE-2026-84829?
No fix has been published for CVE-2026-84829 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-2026-84829 being exploited?
There is no known exploitation of CVE-2026-84829 in the wild and no public exploit code.
Sources
Also known as GHSA-mwqj-x4rq-9232.