CVE-2021-27890
HIGHCVSS 8.8/10EPSS 10.59%
Last modified
CVE-2021-27890 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.. EPSS estimates a 10.59% chance of exploitation in the next 30 days.
Description
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mybb | Mybb | < 1.8.26 |
References
- http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.htmlThird Party Advisory, VDB Entry
- https://blog.sonarsource.com/mybb-remote-code-execution-chainExploit, Third Party Advisory
- https://github.com/mybb/mybb/security/advisories/GHSA-r34m-ccm8-mfhqPatch, Release Notes, Third Party Advisory
- http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.htmlThird Party Advisory, VDB Entry
- https://blog.sonarsource.com/mybb-remote-code-execution-chainExploit, Third Party Advisory
- https://github.com/mybb/mybb/security/advisories/GHSA-r34m-ccm8-mfhqPatch, Release Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27890?
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
How severe is CVE-2021-27890?
CVE-2021-27890 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 10.59% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27890?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27890?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST