CVE-2026-35056 XenForo Remote Code Execution via Authenticated Admin
Authenticated administrators can execute arbitrary code on the server, requiring immediate patching to prevent server compromise.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-35056?
CVE-2026-35056 is a high-severity code injection vulnerability in XenForo, published on 1 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.
Weakness: CWE-94
Which versions are affected by CVE-2026-35056?
It affects 1 product.
Products include Xenforo Xenforo.
How do I fix CVE-2026-35056?
No fix has been published for CVE-2026-35056 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-35056 being exploited?
There is no known exploitation of CVE-2026-35056 in the wild and no public exploit code.
Other vulnerabilities in XenForo
- CVE-2025-71279 XenForo Passkey Security Bypass
- CVE-2026-73309 XenForo < 2.3.13 Authentication Bypass via OAuth2 Token Endpoint
- CVE-2026-73311 XenForo < 2.3.13 OAuth2 Authorization Code Reuse
- CVE-2026-73312 XenForo < 2.3.13 Refresh Token Replay via Expired Access Token
- CVE-2024-38457 Xenforo before 2.2.16 allows CSRF.
Sources
Also known as GHSA-wrgm-wvxf-c44c.