CVE-2023-25135

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

vBulletin before 5.6.9 PL1 allows an unauthenticated remote attacker to execute arbitrary code via a crafted HTTP request that triggers deserialization. This occurs because verify_serialized checks that a value is serialized by calling unserialize and then checking for errors. The fixed versions are 5.6.7 PL1, 5.6.8 PL1, and 5.6.9 PL1.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4473890-vbulletin-5-6-9-security-patchRelease Notes, Vendor Advisory
https://www.ambionics.io/blog/vbulletin-unserializable-but-unreachableExploit, Technical Description, Third Party Advisory
https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4473890-vbulletin-5-6-9-security-patchRelease Notes, Vendor Advisory
https://www.ambionics.io/blog/vbulletin-unserializable-but-unreachableExploit, Technical Description, Third Party Advisory

Timeline

Published: Feb 3, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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