CVE-2026-30913

flarum/nickname: Display name injection in notification emails (autolink & markdown)

Published: Mar 9, 2026Updated: Apr 29, 2026 Sources: CVE List NVD GHSACWE-79

4.6MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

flarum

oss-project·SG

nicknamesOn-prem

Web & CMS Plugins / forum-wiki

Packagist

package-ecosystem

flarum/nicknames

OSS Libraries

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25

github.com

https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28

github.com

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

github.com

and 3 more references View all →

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