Composer flarum/core has 9 known advisories in the phpwarden feed. Feed 2026.10.29.1, updated 2026-10-28.
| CVE | Title | Severity | CVSS | Affected | Fixed in |
|---|---|---|---|---|---|
| CVE-2021-32671 | XSS vulnerability with translator | critical | 10.0 | >=1.0.0 and <1.0.2 | 1.0.2 |
| CVE-2024-21641 | Flarum's logout Route allows open redirects | medium | 6.5 | <1.8.5 | 1.8.5 |
| CVE-2023-27577 | Path Traversal Vulnerability in `LESS` Parser allows reading of sensitive server files | medium | 6.5 | <1.7.0 | 1.7.0 |
| CVE-2022-41938 | Cross site scripting vulnerability with discussion titles | critical | 9.0 | >=1.5.0 and <1.6.2 | 1.6.2 |
| CVE-2023-22489 | Any Flarum user including unactivated can reply in public discussions whose first post was permanently deleted | low | 3.5 | >=1.3.0 and <1.6.3 | 1.6.3 |
| CVE-2023-40033 | Flarum vulnerable to LFI and Blind SSRF via Avatar upload | high | 7.1 | <1.8.0 | 1.8.0 |
| CVE-2025-27794 | Flarum Vulnerable to Session Hijacking via Authoritative Subdomain Cookie Overwrite | medium | 6.8 | <1.8.10 | 1.8.10 |
| CVE-2026-41887 | Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577) | medium | 4.9 | <1.8.16 or >=2.0.0-beta.1 and <2.0.0-rc.1 | 1.8.16, 2.0.0-rc.1 |
| CVE-2023-22488 | Flarum notifications can leak restricted content | medium | 6.8 | <1.6.3 | 1.6.3 |
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