Quick answers
- Is CVE-2026-9357 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-9357 being exploited in the wild.
- How severe is CVE-2026-9357?
- Low severity, with a CVSS score of 3.5, published 24 May 2026.
- Which products and versions are affected?
- Vbulletin 6.x.
- Is there a fix for CVE-2026-9357?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-9357 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-9357?
- Check whether you run Vbulletin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A cross-site scripting (XSS) vulnerability exists in the Login component of vBulletin 6.x. The flaw stems from improper neutralization of user-supplied input during web page generation (CWE-79), which can also lead to code injection (CWE-94). An attacker with low-level privileges can exploit this remotely by manipulating login-related functions, though user interaction is required for the script to execute in the victim's browser. While a public exploit exists, the vendor has reportedly not responded to disclosure attempts, and no official patch is currently confirmed.
Affected products
- vBulletin vBulletin 6.x
Timeline
- 2026-05-24: disclosed: Public disclosure via VulDB and NVD
- 2026-05-24: advisory