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Medium severity5.4NVD Advisory· Published Feb 22, 2021· Updated Jun 17, 2026

CVE-2021-27279

CVE-2021-27279

Description

MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3

MyBB/Mybb3 versions
cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*range: <1.8.25
- (no CPE)
- (no CPE)range: <1.8.25

Patches

Vulnerability mechanics

References

3

github.com/mybb/mybb/commit/cb781b49116bf5c4d8deca3e17498122b701677anvdPatchThird Party Advisory
github.com/mybb/mybb/security/advisories/GHSA-6483-hcpp-p75wnvdExploitThird Party Advisory
mybb.com/versions/1.8.25/nvdRelease NotesVendor Advisory

News mentions

0

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