CVE-2026-88793 YouTube Embed 10.0 - 10.3 - Unauthenticated Stored XSS via youram_server
Unauthenticated attackers can inject malicious scripts via AJAX actions, leading to session hijacking or code execution in admin sessions.
- 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-2026-88793?
CVE-2026-88793 is a high-severity cross-site scripting vulnerability in Unknown YouTube Embed, published on 13 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 YouTube Embed WordPress plugin from 10.0 to 10.3 does not perform any authorisation check on one of its AJAX actions, relying only on a nonce it prints on every front-end page, and does not escape the stored data before rendering it, allowing unauthenticated attackers to store arbitrary web scripts which will execute in the session of any user viewing the affected content, including an administrator.
Weakness: CWE-79
Which versions are affected by CVE-2026-88793?
How do I fix CVE-2026-88793?
No fix has been published for CVE-2026-88793 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-2026-88793 being exploited?
There is no known exploitation of CVE-2026-88793 in the wild and no public exploit code.
Sources
Also known as GHSA-mwfg-r67v-rvfv.