CVE-2026-35057 XenForo Stored Cross-Site Scripting via Structured Text Mentions
Attackers can inject malicious scripts via structured text mentions in XenForo, leading to stored XSS and potential account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-35057?
CVE-2026-35057 is a medium-severity cross-site scripting vulnerability in XenForo, published on 1 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
XenForo before 2.3.10 and before 2.2.19 is vulnerable to stored cross-site scripting (XSS) in structured text mentions, primarily affecting legacy profile post content. An attacker can inject malicious scripts through crafted mentions that are stored and executed when other users view the content.
Weakness: CWE-79
Which versions are affected by CVE-2026-35057?
It affects 1 product.
Products include Xenforo Xenforo.
How do I fix CVE-2026-35057?
No fix has been published for CVE-2026-35057 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-35057 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35057 exists.
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-vrhx-2966-qqfp.