SQL Injection vulnerability in MyBB before 1.8.26 via the Copy Forum feature in Forum Management.

published 2021-03-15 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14665

cvss: 7.2; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

SQL Injection vulnerability in MyBB before 1.8.26 via the Copy Forum feature in Forum Management. (issue 2 of 3).

Patch / fix

fixed in 1 links 1

mybb mybb 1.8.26

github.com/mybb/mybb/security/advisories/GHSA-jjx8-8mcp-7h65 advisory

Exploit prediction

1.00% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.2	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P

Classification

Weakness

CWE-89 Improper Neutralization of Special Elements used in an SQL Command

References

github.com /mybb/mybb/security/advisories/GHSA-jjx8-8mcp-7h65
patch, release-notes, third-party-advisory

Sources

CVE List CVE-2021-27947
NVD CVE-2021-27947

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary