UpHeron
All vulnerabilities

Servers and applications

CVE-2021-41866

ACP Template Name XSS

Severity
Medium 5.4
Published
26 Oct 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.8.28
Also known as
GHSA-gxhv-r3m5-6qv7
Sources
NVD, Project advisories (GitHub)

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.

Affected software

SoftwareAffected versions
MyBBServers and applications · cpe:a:mybb:mybb
  • Every version before 1.8.28
MyBBServers and applications · github:mybb/mybb
  • Every version before 1.8.28

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-41866
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-41866
  • GitHub Advisory Database https://github.com/advisories/GHSA-gxhv-r3m5-6qv7
  • github.com https://github.com/mybb/mybb/security/advisories/GHSA-gxhv-r3m5-6qv7