CVE-2026-9357 vBulletin Login cross site scripting
Remote attackers can execute cross-site scripting attacks via the vBulletin login component, potentially compromising user sessions.
- 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-2026-9357?
CVE-2026-9357 is a medium-severity cross-site scripting vulnerability in vBulletin, published on 24 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
A vulnerability was found in vBulletin 6.x. This impacts an unknown function of the component Login. Performing a manipulation results in cross site scripting. It is possible to initiate the attack remotely. The exploit has been made public and could be used. VulDB is withholding an extended redistribution of exploit details to prevent simplified exploitation. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-9357?
How do I fix CVE-2026-9357?
No fix has been published for CVE-2026-9357 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-2026-9357 being exploited?
There is no known exploitation of CVE-2026-9357 in the wild and no public exploit code.
Sources
Also known as GHSA-8rjw-7777-4jwx.