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CVE-2026-41887

Flarum is open-source forum software. Prior to versions 1.8.16 and 2.0.0-rc.1, Flarum's patch for CVE-2023-27577 restricted the @import and data-uri() LESS features in the custom_less setting, but the same restriction was never applied to other settings registered as LESS config variables (for example theme_primary_color and theme_secondary_color, as well as any key registered via Extend\Settings::registerLessConfigVar()). Those values are interpolated verbatim into the LESS source at compile ti
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:178d529d6eed7c04c1fa04974601887bda06d506fcd4edcf0541a4726a83e6d5
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"framework","vendor":"flarum","versions":[{"status":"affected","version":"< 1.8.16"},{"status":"affected","version":">= 2.0.0-beta.1, < 2.0.0-rc.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/problemTypes/1/descriptions/0

Source references

5 source assertions
{"name":"https://github.com/flarum/framework/commit/2d90a1f19f0e46f8c7e1b07c48ba74b5e38f8410","tags":["x_refsource_MISC"],"url":"https://github.com/flarum/framework/commit/2d90a1f19f0e46f8c7e1b07c48ba74b5e38f8410"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/references/1
{"name":"https://github.com/flarum/framework/releases/tag/v1.8.16","tags":["x_refsource_MISC"],"url":"https://github.com/flarum/framework/releases/tag/v1.8.16"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/references/2
{"name":"https://github.com/flarum/framework/releases/tag/v2.0.0-rc.1","tags":["x_refsource_MISC"],"url":"https://github.com/flarum/framework/releases/tag/v2.0.0-rc.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/adp/0/references/0
{"name":"https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878","tags":["x_refsource_CONFIRM"],"url":"https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5d6b387b53d98be8730dc46a5007d1018798dbeb84f49a4ab7adbe16d83315d9 · sha256:e5501ad0a0462a6b… · /containers/cna/references/0

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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