CVE-2026-41887 Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577)

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 customless setting, but the same restriction was never applied to other settings registered as LESS config variables for exampl...