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

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Summary

CVECVE-2026-30913
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-10 17:40:15 UTC
Updated2026-04-29 20:49:53 UTC
DescriptionFlarum 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.

Risk And Classification

Primary CVSS: v3.1 4.6 MEDIUM from [email protected]

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

EPSS: 0.000330000 probability, percentile 0.096280000 (date 2026-05-05)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.6MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
3.1CNADECLARED4.6MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Flarum Nicknames affected < 1.8.3 Not specified

References

ReferenceSourceLinkTags
github.com/flarum/nicknames/releases/tag/v1.8. [email protected] github.com
github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28 [email protected] github.com
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