SQL Injection in Mybb
CVE-2021-27890
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
Vulnerability class: SQL Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.106 (95.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.106 · newest: 0.106 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/mybb/mybb/security/advisories/GHSA-r34m-ccm8-mfhq (Patch, Third Party Advisory, Release Notes)
- packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html (VDB Entry, Third Party Advisory)
- blog.sonarsource.com/mybb-remote-code-execution-chain (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-27890?
- CVE-2021-27890 is a high-severity vulnerability in Mybb, classified under SQL Injection. CVSS score: 8.8/10. Published 2021-03-15.
- How severe is CVE-2021-27890?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-27890 known to be exploited?
- 19 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.