CVE-2026-35055 — MEDIUM (6.1)

Q: How severe is CVE-2026-35055?

CVE-2026-35055 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-35055?

Check the references section above for vendor advisories and patch information. Affected products include: Xenforo Xenforo.

Vulnerability Description

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.

CVSS Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Xenforo	Xenforo	< 2.2.18

Related Weaknesses (CWE)

CWE-79

References

https://www.vulncheck.com/advisories/xenforo-cross-site-scripting-via-lightbox-iThird Party Advisory
https://xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-secRelease Notes

FAQ

What is CVE-2026-35055?

CVE-2026-35055 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 po...

How severe is CVE-2026-35055?

CVE-2026-35055 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-35055?

Check the references section above for vendor advisories and patch information. Affected products include: Xenforo Xenforo.