What’s Vulnerable › Vulnerabilities

CVE-2020-17496: vBulletin PHP Module Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 87.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-08-12 · updated 2026-06-17
• Weakness: CWE-74

Description

vBulletin 5.5.4 through 5.6.2 allows remote command execution via crafted subWidgets data in an ajax/render/widget_tabbedcontainer_tab_panel request. NOTE: this issue exists because of an incomplete fix for CVE-2019-16759.

Affected products

• vBulletin: from 5.5.4 through 5.6.2

References

• https://blog.exploitee.rs/2020/exploiting-vbulletin-a-tale-of-patch-fail/
• https://cwe.mitre.org/data/definitions/78.html
• https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4445227-vbulletin-5-6-0-5-6-1-5-6-2-security-patch
• https://seclists.org/fulldisclosure/2020/Aug/5
• https://blog.exploitee.rs/2020/exploiting-vbulletin-a-tale-of-patch-fail/
• https://cwe.mitre.org/data/definitions/78.html
• https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4445227-vbulletin-5-6-0-5-6-1-5-6-2-security-patch
• https://seclists.org/fulldisclosure/2020/Aug/5
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-17496

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