Vulnerability-Lookup

CVE-2026-30913 (GCVE-0-2026-30913)

Vulnerability from cvelistv5 – Published: 2026-03-09 22:42 – Updated: 2026-03-10 14:17

Title

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

Summary

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.

Severity

4.6 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-10 14:17 UTC

CWE

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

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/flarum/framework/security/advi…	x_refsource_CONFIRM
https://github.com/flarum/nicknames/commit/4dde99…	x_refsource_MISC
https://github.com/flarum/nicknames/releases/tag/v1.8.	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
flarum	nicknames	Affected: < 1.8.3	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-30913

Vulnerability from fkie_nvd - Published: 2026-03-10 17:40 - Updated: 2026-06-17 10:33

Severity

4.6 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25
	security-advisories@github.com	https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28
	security-advisories@github.com	https://github.com/flarum/nicknames/releases/tag/v1.8.
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nicknames",
          "vendor": "flarum",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.3"
            }
          ]
        }
      ],
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    }
  ],
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  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Flarum es un software de foro de c\u00f3digo abierto. Cuando la extensi\u00f3n flarum/nicknames est\u00e1 habilitada, un usuario registrado puede establecer su apodo a una cadena que los clientes de correo electr\u00f3nico interpretan como un hiperv\u00ednculo. El apodo se inserta textualmente en los correos electr\u00f3nicos de notificaci\u00f3n de texto sin formato, y los destinatarios pueden ser enga\u00f1ados para que visiten dominios controlados por el atacante."
    }
  ],
  "id": "CVE-2026-30913",
  "lastModified": "2026-06-17T10:33:08.410",
  "metrics": {
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          "baseScore": 4.6,
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}

GHSA-3C4M-J3G4-HH25

Vulnerability from github – Published: 2026-03-10 00:56 – Updated: 2026-03-10 18:44

Summary

flarum/nicknames extension has display name injection in notification emails (autolink & markdown)

Details

Summary

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.

Affected package

flarum/nicknames — permissive display name driver that allows special characters; affected since initial release on the 1.x branch

Any third-party display name driver that permits special characters would be equally affected.

Variants

Domain autolink — a nickname such as nasty.com is automatically converted to a clickable hyperlink by virtually all email clients (Gmail, Outlook, Apple Mail, Thunderbird).
Markdown link syntax — a nickname such as [CLICK](https://evil.com) is rendered as a clickable hyperlink by email clients that auto-render markdown in plain-text emails (e.g. Apple Mail, Thunderbird).

Steps to reproduce

Variant 1 (autolink — affects all email clients) 1. Enable flarum/nicknames, set nickname to nasty.com 2. Trigger a notification email to another user (e.g. follow them, mention them) 3. The nickname appears as a clickable link in the received email

Variant 2 (markdown — affects markdown-rendering email clients) 1. Enable flarum/nicknames, set nickname to [CLICK](https://evil.com) 2. Trigger a notification email to another user 3. In a markdown-rendering email client (e.g. Apple Mail), the nickname appears as a clickable link

Impact

Phishing / social engineering: victims may be misled into visiting attacker-controlled URLs via links appearing to originate from a trusted platform notification email. Variant 1 is exploitable against virtually all email clients without any special conditions.

CVSS v3.1: AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N — 4.6 Medium

Root cause

The default username-based display name driver constrains values to [a-zA-Z0-9_-]+, making it immune. flarum/nicknames introduced permissive validation (min/max length and an optional admin-configured regex) that allows arbitrary characters including those meaningful in URL and markdown contexts. This has been the case since the first commit of the extension.

Proposed fix

Add validation in flarum/nicknames to reject or sanitize nicknames containing characters that email clients may interpret as URLs or markdown links
Alternatively, sanitize the display name before insertion into notification email bodies so that legitimate nicknames like Jane.Smith are preserved but rendered safely

References

Bug bounty submission: SBB-L4ZVAFH8 (Intigriti)

Severity

4.6 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "flarum/nicknames"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-30913"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-10T00:56:30Z",
    "nvd_published_at": "2026-03-10T17:40:15Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nWhen 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.\n\n## Affected package\n\n- **`flarum/nicknames`** \u2014 permissive display name driver that allows special characters; affected since initial release on the `1.x` branch\n\nAny third-party display name driver that permits special characters would be equally affected.\n\n## Variants\n\n1. **Domain autolink** \u2014 a nickname such as `nasty.com` is automatically converted to a clickable hyperlink by virtually all email clients (Gmail, Outlook, Apple Mail, Thunderbird).\n2. **Markdown link syntax** \u2014 a nickname such as `[CLICK](https://evil.com)` is rendered as a clickable hyperlink by email clients that auto-render markdown in plain-text emails (e.g. Apple Mail, Thunderbird).\n\n## Steps to reproduce\n\n**Variant 1 (autolink \u2014 affects all email clients)**\n1. Enable `flarum/nicknames`, set nickname to `nasty.com`\n2. Trigger a notification email to another user (e.g. follow them, mention them)\n3. The nickname appears as a clickable link in the received email\n\n**Variant 2 (markdown \u2014 affects markdown-rendering email clients)**\n1. Enable `flarum/nicknames`, set nickname to `[CLICK](https://evil.com)`\n2. Trigger a notification email to another user\n3. In a markdown-rendering email client (e.g. Apple Mail), the nickname appears as a clickable link\n\n## Impact\n\nPhishing / social engineering: victims may be misled into visiting attacker-controlled URLs via links appearing to originate from a trusted platform notification email. Variant 1 is exploitable against virtually all email clients without any special conditions.\n\n- CVSS v3.1: `AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N` \u2014 **4.6 Medium**\n\n## Root cause\n\nThe default username-based display name driver constrains values to `[a-zA-Z0-9_-]+`, making it immune. `flarum/nicknames` introduced permissive validation (min/max length and an optional admin-configured regex) that allows arbitrary characters including those meaningful in URL and markdown contexts. This has been the case since the first commit of the extension.\n\n## Proposed fix\n\n- Add validation in `flarum/nicknames` to reject or sanitize nicknames containing characters that email clients may interpret as URLs or markdown links\n- Alternatively, sanitize the display name before insertion into notification email bodies so that legitimate nicknames like `Jane.Smith` are preserved but rendered safely\n\n## References\n\n- Bug bounty submission: SBB-L4ZVAFH8 (Intigriti)",
  "id": "GHSA-3c4m-j3g4-hh25",
  "modified": "2026-03-10T18:44:19Z",
  "published": "2026-03-10T00:56:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30913"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/flarum/framework"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flarum/nicknames/releases/tag/v1.8."
    },
    {
      "type": "WEB",
      "url": "https://github.com/flarum/nicknames/releases/tag/v1.8.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "flarum/nicknames extension has display name injection in notification emails (autolink \u0026 markdown)"
}

Sightings

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Action not permitted

CVE-2026-30913 (GCVE-0-2026-30913)

FKIE_CVE-2026-30913

GHSA-3C4M-J3G4-HH25

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