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The vulnerability has been fixed and published as flarum/core v1.8.5. As a workaround, some extensions modifying the logout route can remedy this issue if their implementation is safe.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2024-21641","reference_id":"","reference_type":"","scores":[{"value":"0.37939","scoring_system":"epss","scoring_elements":"0.97311","published_at":"2026-06-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2024-21641"},{"reference_url":"https://github.com/flarum/framework/commit/7d70328471cf3091d92d95c382d277aec7996176","reference_id":"7d70328471cf3091d92d95c382d277aec7996176","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-05-08T15:56:54Z/"}],"url":"https://github.com/flarum/framework/commit/7d70328471cf3091d92d95c382d277aec7996176"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21641","reference_id":"CVE-2024-21641","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21641"},{"reference_url":"https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a","reference_id":"ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-05-08T15:56:54Z/"}],"url":"https://github.com/flarum/flarum-core/commit/ee8b3b4ad1413a2b0971fdd9e40f812d2a3a9d3a"},{"reference_url":"https://github.com/advisories/GHSA-733r-8xcp-w9mr","reference_id":"GHSA-733r-8xcp-w9mr","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-733r-8xcp-w9mr"},{"reference_url":"https://github.com/flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr","reference_id":"GHSA-733r-8xcp-w9mr","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-05-08T15:56:54Z/"}],"url":"https://github.com/flarum/framework/security/advisories/GHSA-733r-8xcp-w9mr"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/28283?format=json","purl":"pkg:composer/flarum/core@1.8.5","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:composer/flarum/core@1.8.5"}],"aliases":["CVE-2024-21641","GHSA-733r-8xcp-w9mr"],"risk_score":null,"exploitability":null,"weighted_severity":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-9cqz-xdsy-ayef"}],"fixing_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/150514?format=json","vulnerability_id":"VCID-8vds-pw69-u3et","summary":"Flarum is an open source forum software. Flarum is affected by a vulnerability that allows an attacker to conduct a Blind Server-Side Request Forgery (SSRF) attack or disclose any file on the server, even with a basic user account on any Flarum forum. By uploading a file containing a URL and spoofing the MIME type, an attacker can manipulate the application to execute unintended actions. The vulnerability is due to the behavior of the `intervention/image` package, which attempts to interpret the supplied file contents as a URL, which then fetches its contents. This allows an attacker to exploit the vulnerability to perform SSRF attacks, disclose local file contents, or conduct a blind oracle attack. This has been patched in Flarum version 1.8.0. Users are advised to upgrade. Users unable to upgrade may disable PHP's `allow_url_fopen` which will prevent the fetching of external files via URLs as a temporary workaround for the SSRF aspect of the vulnerability.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-40033","reference_id":"","reference_type":"","scores":[{"value":"0.00195","scoring_system":"epss","scoring_elements":"0.41375","published_at":"2026-06-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-40033"},{"reference_url":"https://github.com/flarum/framework","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/flarum/framework"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40033","reference_id":"","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40033"},{"reference_url":"https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570","reference_id":"d1059c1cc79fe61f9538f3da55e8f42abbede570","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-02T15:56:22Z/"}],"url":"https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570"},{"reference_url":"https://github.com/advisories/GHSA-67c6-q4j4-hccg","reference_id":"GHSA-67c6-q4j4-hccg","reference_type":"","scores":[],"url":"https://github.com/advisories/GHSA-67c6-q4j4-hccg"},{"reference_url":"https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg","reference_id":"GHSA-67c6-q4j4-hccg","reference_type":"","scores":[{"value":"7.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-02T15:56:22Z/"}],"url":"https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/380731?format=json","purl":"pkg:composer/flarum/core@1.8.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-9cqz-xdsy-ayef"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:composer/flarum/core@1.8.0"}],"aliases":["CVE-2023-40033","GHSA-67c6-q4j4-hccg"],"risk_score":null,"exploitability":null,"weighted_severity":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-8vds-pw69-u3et"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:composer/flarum/core@1.8.0"}