CVE-2026-61511

CVE Enrichment

CVSS: 9.3 CRITICAL
EPSS: 5.61%
EPSS Percentile: 92.86%
CISA KEV: Not listed

Description

vBulletin 5.x through 5.7.5 and 6.x through 6.2.1 contains an eval injection vulnerability in the vB5_Template_Runtime::runMaths() method within the template runtime that allows unauthenticated remote attackers to execute arbitrary PHP code by supplying crafted input through the pagenav[pagenumber] parameter. Attackers can exploit the insufficiently restrictive regex filter by using phpfuck-style encoding with permitted characters to inject and execute arbitrary PHP code via the unauthenticated ajax/render template route without any authentication.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: [email protected]
Published: 27-Jul-2026 21:16
Last Modified: 14-Oct-2026 11:18
EPSS Date: 2026-10-26
CWE: CWE-95

CVSS Vector


            CVSS:4.0                            AV:N /
                            AC:L /
                            AT:N /
                            PR:N /
                            UI:N /
                            VC:H /
                            VI:H /
                            VA:H /
                            SC:N /
                            SI:N /
                            SA:N /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

References

Last enrichment sync: 27-Oct-2026 03:10
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (2)

A critical flaw in vBulletin, tracked as CVE-2026-61511, lets unauthenticated attackers execute arbitrary PHP code through template rendering and can lead to remote code execution on vulnerable servers. vBulletin patches critical unauthenticated RCE flaw with public PoC
Public exploit details published on July 27 describe CVE-2026-61511, an unauthenticated remote code execution flaw in vBulletin’s template engine that can reach PHP’s eval() and execute commands on unpatched forum Public Exploit Details Expose Patched vBulletin Pre-Auth RCE

CVE (2)

People (2)

MITRE ATT&CK (2)

Products (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.