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CVE-2019-16759: vBulletin PHP Module Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2019-16759
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
The PHP module within vBulletin contains an unspecified vulnerability that allows for remote code execution via the widgetConfig[code] parameter in an ajax/render/widget_php routestring request.

CSIRTS triage

vendor: vBulletinproduct: vBulletin PHP ModuleRemote code execution
What
An unspecified vulnerability allows for remote code execution via a specific parameter in an AJAX request.
Who is affected
Deployments of the vBulletin PHP Module are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patch for the vBulletin PHP Module.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-16759

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2019-16759coverage & exploitation statusNVD · CVE.org

Recent advisories for vBulletin PHP Module

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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