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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25
security-advisories@github.com
https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdc…
security-advisories@github.com
https://github.com/flarum/nicknames/releases/tag/v1.8.
security-advisories@github.com