CVE-2021-41866 — MEDIUM (5.4)

Q: What is CVE-2021-41866?

CVE-2021-41866 is a vulnerability with a CVSS score of 5.4 (MEDIUM). MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.

Q: How severe is CVE-2021-41866?

CVE-2021-41866 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2021-41866?

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

Vulnerability Description

MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.

CVSS Score

5.4

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Mybb	Mybb	< 1.8.28

Related Weaknesses (CWE)

CWE-79

References

https://github.com/mybb/mybb/security/advisories/Third Party Advisory
https://github.com/mybb/mybb/security/advisories/GHSA-gxhv-r3m5-6qv7PatchThird Party Advisory
https://github.com/mybb/mybb/security/advisories/Third Party Advisory
https://github.com/mybb/mybb/security/advisories/GHSA-gxhv-r3m5-6qv7PatchThird Party Advisory

FAQ

What is CVE-2021-41866?

CVE-2021-41866 is a vulnerability with a CVSS score of 5.4 (MEDIUM). MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.

How severe is CVE-2021-41866?

CVE-2021-41866 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-41866?

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