CVE-2026-61511 json
vBulletin < 6.2.2 Eval Injection RCE via vb5/template/runtime.php
published 2026-07-27 3 mo ago modified 2026-11-03 5 d ago also EUVD-2026-49312
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.6%
- EPSS 5.6% chance of exploitation in 30 days, percentile 92%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- vBulletin vBulletin 6.2.2
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 26 d ago
Exploit prediction
5.61% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template vBulletin 6.x - Remote Code Execution nuclei detection template
- karmainsecurity.com https://karmainsecurity.com/KIS-2026-13 referenced PoC, tagged "exploit" by a source, unverified
- ssd-disclosure.com https://ssd-disclosure.com/vbulletin-runtime-template-runmaths-preauth-rce/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | 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 |
Affected products
- vBulletin vBulletin
Classification
- Weakness
-
- CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code
References
-
karmainsecurity.com
/KIS-2026-13
technical-description, exploit
-
ssd-disclosure.com
/vbulletin-runtime-template-runmaths-preauth-rce/
technical-description, exploit
- forum.vbulletin.com /forum/vbulletin-announcements/vbulletin-announcements_aa/4509358-security-patch-released-for-vbulletin-6-2-1-
- forum.vbulletin.com /forum/vbulletin-announcements/vbulletin-announcements_aa/4509404-vbulletin-6-2-2-is-available
-
vulncheck.com
/advisories/vbulletin-eval-injection-rce-via-vb5-template-runtime-php
third-party-advisory
- seclists.org /fulldisclosure/2026/Aug/29
Sources
- CVE List CVE-2026-61511
- NVD CVE-2026-61511
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