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.
CVE-2026-61511
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-61511
vBulletin
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "vBulletin",
"product": "vBulletin",
"versions": [
{
"status": "affected",
"version": "5.0.0",
"versionType": "semver",
"lessThanOrEqual": "5.7.5"
},
{
"status": "affected",
"version": "6.0.0",
"versionType": "semver",
"lessThanOrEqual": "6.2.1"
},
{
"status": "unaffected",
"version": "6.2.2",
"versionType": "semver"
}
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-61511
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #21424 · Revision 1
- Added to Heist Feed
- Publisher date