---
cve: "CVE-2026-61511"
severity: "CRITICAL"
cvss: 9.3
epss: "1.7%"
vendor: "vBulletin"
kev: false
exploited: false
published: "2026-07-27 12:39:16"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T05:02:12+02:00"
---

# CVE-2026-61511

> 9.3 CRITICAL

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://karmainsecurity.com/KIS-2026-13>
- <https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/>
- <https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509358-security-patch-released-for-vbulletin-6-2-1-6-2-0-and-6-1-6>
- <https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4509404-vbulletin-6-2-2-is-available>
- <https://www.vulncheck.com/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-php>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-61511) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_