XenForo before 2.3.9 and before 2.2.18 is vulnerable to cross-site scripting (XSS) related to lightbox usage in posts.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Apr 1, 2026 · NIST NVD

   Detected

   XenForo before 2.3.9 and before 2.2.18 is vulnerable to cross-site scripting (XSS) related to lightbox usage in posts. An attacker can inject malicious scripts that execute when users interact with post content displayed in the lightbox.

2. Jun 17, 2026 · NIST NVD

   Updated

   XenForo before 2.3.9 and before 2.2.18 is vulnerable to cross-site scripting (XSS) related to lightbox usage in posts. An attacker can inject malicious scripts that execute when users interact with post content displayed in the lightbox.

Affected

• cpe xenforo/xenforoversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-35055

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-35055

  XenForo before 2.3.9 and before 2.2.18 is vulnerable to cross-site scripting (XSS) related to lightbox usage in posts. An attacker can inject malicious scripts that execute when users interact with post content displayed in the lightbox.

  nvd.nist.gov

References

• Third Party Advisory · vulncheck.com
• Release Notes · xenforo.com