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

EPSS: 0.106 (95.3th percentile) — read the EPSS interpretation.

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.

Affected products

Mybb
N/a — versions n/a

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC, Release Notes)
cve@mitre.org (VDB Entry, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

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.