Vulnerability · Published May 24, 2026 · Assigned by VulDB

CVE-2026-9357vBulletin Login cross site scripting

Low 3.5

In plain English

A low-severity cross-site scripting in vBulletin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)3.5Low

Exploit odds (30 days)0.3%top 79.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
n/a	vBulletin	6.*

Weakness: CWE-79, CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

References

VDB-365320 | vBulletin Login cross site scripting vdb-entry
VDB-365320 | CTI Indicators (IOB, IOC, TTP) signature, permissions-required
Submit #813052 | Cross Site Scripting no fórum vBulletin 6.xx Vbulletin 6.x.x Cross Site Scripting third-party-advisory