CVE-2026-61511: vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php
- Is it exploited?
Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .
VulnCheck KEV lists it since . It cites 1 public report, the first from . VulnCheck's own honeypots also recorded exploitation attempts.
- How likely is exploitation in the next 30 days?
- 5.6%
EPSS score, percentile 92.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.
CISA's SSVC assessment in the CVE record lists exploitation as poc.
- How severe?
- 9.3 Critical
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 5.0.0 through 5.7.5
- 6.0.0 through 6.2.1
Unaffected 6.2.2
Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php
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.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (1 product)
| Status | Versions |
|---|---|
| Affected | 5.0.0 through 5.7.5 |
| Affected | 6.0.0 through 6.2.1 |
| Unaffected | 6.2.2 |
Versions not listed are: affected.
Versions the record lists as unaffected: 6.2.2.
Source: CVE List, as of . About the data.
Weakness
CWE-95
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
5
Known exploited vBulletin vulnerabilities
- CVE-2019-16759: vBulletin PHP Module Remote Code Execution Vulnerability
- CVE-2020-17496: vBulletin PHP Module Remote Code Execution Vulnerability