CVE-2026-30913

4.6 mediumEPSS 0.2%

Medium (4.6). EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.6 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-03-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25
https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28
https://github.com/flarum/nicknames/releases/tag/v1.8.
https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25

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