UpHeron
All vulnerabilities

Servers and applications

CVE-2021-27890

Theme properties SQL injection

Severity
High 8.8
Published
10 Mar 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.8.26
Also known as
GHSA-r34m-ccm8-mfhq
Sources
NVD, Project advisories (GitHub)

Description

SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.

Affected software

SoftwareAffected versions
MyBBServers and applications · cpe:a:mybb:mybb
  • Every version before 1.8.26
MyBBServers and applications · github:mybb/mybb
  • Every version before 1.8.26

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-27890
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-27890
  • GitHub Advisory Database https://github.com/advisories/GHSA-r34m-ccm8-mfhq
  • github.com https://github.com/mybb/mybb/security/advisories/GHSA-r34m-ccm8-mfhq