CVE-2019-16759VulnerabilityPublished 11/03/2021Updated 10/24/2026

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

Affects vBulletin vBulletinSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
EPSS: 99.7% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2019-16759 (opens in a new tab)

Description

CVE-2019-16759 is a remote code execution vulnerability in the PHP module of vBulletin. It is triggered via the widgetConfig[code] parameter in an ajax/render/widget_php routestring request. This vulnerability has been exploited in the wild. No specific affected versions or patch information is provided.

Summary

The PHP module within vBulletin contains an unspecified vulnerability that allows remote attackers to execute arbitrary code by sending crafted requests to the ajax/render/widget_php endpoint, specifically manipulating the widgetConfig[code] parameter. This vulnerability is identified as CWE-94 (Improper Control of Generation of Code). It has been observed to be exploited in the wild, indicating active threat usage. No vendor patch or remediation details are provided in the available data.

Impact

Successful exploitation allows remote attackers to execute arbitrary code on the affected vBulletin server, potentially leading to full system compromise. The vulnerability has been exploited in the wild, confirming active risk to affected installations.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a vendor fix is available, restrict access to the vulnerable ajax/render/widget_php endpoint and monitor for suspicious activity related to widgetConfig[code] parameter usage.

Weaknesses

CWE-94Code Injection (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 08:43:08 UTC

Weaknesses

References

Related threats