CVE-2026-30913

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.

CVSS v3.1

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

CVSS v3.1

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

EPSS

0.17% chance of exploitation in the next 30 days, 6th percentile

Published

2026-03-09

Updated

2026-03-10

Proof-of-concept exploits (1)

• advisories/GHSA-3c4m-j3g4-hh25

References

• CVE Record
• NVD entry

Related

• CVE-2026-30887
• CVE-2026-30920
• CVE-2026-30886
• CVE-2026-30921
• CVE-2026-30885
• CVE-2026-30922