CVE-2021-41866
MEDIUMCVSS 5.4/10EPSS 0.48%
Last modified
CVE-2021-41866 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mybb | Mybb | < 1.8.28 |
References
- https://github.com/mybb/mybb/security/advisories/Third Party Advisory
- https://github.com/mybb/mybb/security/advisories/GHSA-gxhv-r3m5-6qv7Patch, Third Party Advisory
- https://github.com/mybb/mybb/security/advisories/Third Party Advisory
- https://github.com/mybb/mybb/security/advisories/GHSA-gxhv-r3m5-6qv7Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-41866?
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 a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.
How do I fix CVE-2021-41866?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-41866?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST