Low severity · published May 24, 2026
CVE-2026-9357
vBulletin Login cross site scripting
3.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VB
vBulletin · Vbulletin
6.* · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9357
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9357
vuldb.com
https://vuldb.com/submit/813052
vuldb.com
https://vuldb.com/vuln/365320
vuldb.com
https://vuldb.com/vuln/365320/cti
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