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CVE-2026-30913

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7d4b69fb8651bcbcc99d831d0fecc47d7eb35e2d9604501651a2b2fa9b14ffd9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"nicknames","vendor":"flarum","versions":[{"status":"affected","version":"< 1.8.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8b13c0dacc563529fb7b3cda21a89f85e5f75a5a62de11552128a568d2b98067 · sha256:367bda0ff0798b04… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.6,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8b13c0dacc563529fb7b3cda21a89f85e5f75a5a62de11552128a568d2b98067 · sha256:367bda0ff0798b04… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8b13c0dacc563529fb7b3cda21a89f85e5f75a5a62de11552128a568d2b98067 · sha256:367bda0ff0798b04… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["exploit"],"url":"https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8b13c0dacc563529fb7b3cda21a89f85e5f75a5a62de11552128a568d2b98067 · sha256:367bda0ff0798b04… · /containers/adp/0/references/0
{"name":"https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25","tags":["x_refsource_CONFIRM"],"url":"https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8b13c0dacc563529fb7b3cda21a89f85e5f75a5a62de11552128a568d2b98067 · sha256:367bda0ff0798b04… · /containers/cna/references/0
{"name":"https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28","tags":["x_refsource_MISC"],"url":"https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8b13c0dacc563529fb7b3cda21a89f85e5f75a5a62de11552128a568d2b98067 · sha256:367bda0ff0798b04… · /containers/cna/references/1
{"name":"https://github.com/flarum/nicknames/releases/tag/v1.8.","tags":["x_refsource_MISC"],"url":"https://github.com/flarum/nicknames/releases/tag/v1.8."}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8b13c0dacc563529fb7b3cda21a89f85e5f75a5a62de11552128a568d2b98067 · sha256:367bda0ff0798b04… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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