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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
NVD MITRE
4.6CVSSMEDIUM
EPSS Score
0.2%
Top 94.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:UC:LI:LA:N
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

nicknamesflarum
On-prem
Web & CMS Plugins / forum-wiki
flarum/nicknamesPackagistOSS Libraries
flarumoss-projectSGWeb & CMS Plugins
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

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 →

Timeline

Published
Mar 9, 2026
Last Updated
Apr 29, 2026

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