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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.

PUBLISHED Reserved 2026-05-23 | Published 2026-05-24 | Updated 2026-05-26 | Assigner VulDB




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
LOW: 3.5CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
LOW: 3.5CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
4.0AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

Problem types

Cross Site Scripting

Code Injection

Timeline

2026-05-23:Advisory disclosed
2026-05-23:VulDB entry created
2026-05-23:VulDB entry last update

Credits

chor4o (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/365320 (VDB-365320 | vBulletin Login cross site scripting) vdb-entry

vuldb.com/vuln/365320/cti (VDB-365320 | CTI Indicators (IOB, IOC, TTP)) signature permissions-required

vuldb.com/submit/813052 (Submit #813052 | Cross Site Scripting no fórum vBulletin 6.xx Vbulletin 6.x.x Cross Site Scripting) third-party-advisory

cve.org (CVE-2026-9357)

nvd.nist.gov (CVE-2026-9357)

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