CVE-2026-30913— flarum/nickname: Display name injection in notification emails (autolink & markdown)
Quick assessment
Affected
flarum nicknames
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Flarum是Flarum开源的一个用于构建社区的简单论坛软件。 Flarum存在安全漏洞，该漏洞源于flarum/nicknames扩展启用时，注册用户可将昵称设置为电子邮件客户端解释为超链接的字符串，可能导致收件人被误导访问攻击者控制的域。
Possible ATT&CK Techniques 1 AI
T1566.002 · Spearphishing Link
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I. Basic Information for CVE-2026-30913
Vulnerability Information
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Vulnerability Title
flarum/nickname: Display name injection in notification emails (autolink & markdown)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Flarum 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flarum是Flarum开源的一个用于构建社区的简单论坛软件。 Flarum存在安全漏洞，该漏洞源于flarum/nicknames扩展启用时，注册用户可将昵称设置为电子邮件客户端解释为超链接的字符串，可能导致收件人被误导访问攻击者控制的域。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-30913
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Patches & Fixes for CVE-2026-30913 (1)
-
Merge commit from fork · flarum/nicknames@4dde997 · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-30913 (1)
IV. Related Vulnerabilities
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FoF Pretty Mail 1.1.2 Local File Inclusion via Email Templat
Same weakness: CWE-79
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V. Comments for CVE-2026-30913
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