CVE-2026-11588 EONSR AEO Agent <= 3.7.9 - Unauthenticated Stored XSS via Scheduled Post Creation
Unauthenticated attackers can inject malicious scripts via scheduled posts, leading to code execution and potential account takeover for administrators.
- 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-2026-11588?
CVE-2026-11588 is a medium-severity cross-site scripting vulnerability in Unknown EONSR AEO Agent, published on 6 Aug 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 EONSR AEO Agent WordPress plugin through 3.7.9 does not perform any authorisation check on one of its REST API routes and disables HTML sanitisation before saving the post, allowing unauthenticated attackers to create administrator-attributed published posts containing arbitrary web scripts that execute in the browser of any visitor, including administrators (Stored XSS).
Weakness: CWE-79
Which versions are affected by CVE-2026-11588?
How do I fix CVE-2026-11588?
No fix has been published for CVE-2026-11588 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-2026-11588 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-11588 exists.
Sources
Also known as GHSA-r9hf-x848-v6cc.