RCE in Vbulletin
CVE-2026-9357
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Vbulletin — versions 6.*
Weakness classification (CWE)
References
- vuldb.com/vuln/365320 (vdb-entry)
- vuldb.com/vuln/365320/cti (signature, permissions-required)
- vuldb.com/submit/813052 (third-party-advisory)
Frequently asked questions
- What is CVE-2026-9357?
- CVE-2026-9357 is a low-severity vulnerability in Vbulletin, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-05-24.
- How severe is CVE-2026-9357?
- Low severity. CVSS v3 base score is 3.5 out of 10.