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    CVE-2023-25135

    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.

    Published:Feb 3, 2023
    Last Modified:Mar 26, 2025
    EPS:Feb 3, 2023
    EPSS Score:0.93072
    CVSS Score:9.8

    Affected Products

    Vendor
    Vbulletin
    Product
    Vbulletin

    Exploits

    https://www.ambionics.io/blog/vbulletin-unserializable-but-unreachablehttps://www.ambionics.io/blog/vbulletin-unserializable-but-unreachable

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-586 Object Injection

    Related CVEs

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    CVE-2025-46171 (CVSS 5.4) — vBulletin 3.8.7 is vulnerable to a denial-of-service condition via the misc.php?do=buddylist endpoint. If an a…
    CVE-2025-48828 (CVSS 9) — Certain vBulletin versions might allow attackers to execute arbitrary PHP code by abusing Template Conditional…
    CVE-2025-48827 (CVSS 10) — vBulletin 5.0.0 through 5.7.5 and 6.0.0 through 6.0.3 allows unauthenticated users to invoke protected API con…
    CVE-2023-39777 (CVSS 5.4) — A cross-site scripting (XSS) vulnerability in the Admin Control Panel of vBulletin 5.7.5 and 6.0.0 allows atta…
    CVE-2020-7373 (CVSS 9.8) — vBulletin 5.5.4 through 5.6.2 allows remote command execution via crafted subWidgets data in an ajax/render/wi…
    CVE-2020-25115 (CVSS 4.8) — The Admin CP in vBulletin 5.6.3 allows XSS via an Occupation Title or Description to User Profile Field Manage…
    CVE-2020-25116 (CVSS 4.8) — The Admin CP in vBulletin 5.6.3 allows XSS via an Announcement Title to Channel Manager.…
    CVE-2020-25117 (CVSS 4.8) — The Admin CP in vBulletin 5.6.3 allows XSS via a Junior Member Title to User Title Manager.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High