CVE-2026-30913

Description

Flarum is open-source forum software. When the flarum/nicknames extension is enabled, a registered user can set their nickname to a string that email clients interpret as a hyperlink. The nickname is inserted verbatim into plain-text notification emails, and recipients may be misled into visiting attacker-controlled domains.

PUBLISHED Reserved 2026-03-07 | Published 2026-03-09 | Updated 2026-03-10 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...mework/security/advisories/GHSA-3c4m-j3g4-hh25 exploit

github.com/...mework/security/advisories/GHSA-3c4m-j3g4-hh25

github.com/...ommit/4dde99729abdce8f6e2a7437c86e38735fdcca28

github.com/flarum/nicknames/releases/tag/v1.8.

cve.org (CVE-2026-30913)

nvd.nist.gov (CVE-2026-30913)

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