{"id":"CVE-2023-42450","aliases":["BIT-mastodon-2023-42450","EUVD-2023-46896","GHSA-hcqf-fw2r-52g4"],"status":"published","title":"Mastodon Server-Side Request Forgery vulnerability","description":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0046,"percentile":0.40123,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-113","CWE-918"],"published":"2023-09-19T15:53:39Z","modified":"2026-10-28T02:31:01Z","fixes":[{"ecosystem":"Bitnami","package":"mastodon","fixed_in":["4.2.0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mastodon","ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0-beta1"},{"fixed":"4.2.0"},{"introduced":"4.2.0-beta2"},{"fixed":"4.2.0"},{"introduced":"4.2.0-beta3"},{"fixed":"4.2.0"},{"introduced":"4.2.0-rc1"},{"fixed":"4.2.0"}]}]}],"products":[{"vendor":"joinmastodon","product":"mastodon"},{"vendor":"mastodon","product":"mastodon"}],"references":[{"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-hcqf-fw2r-52g4","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","web","advisory"]},{"url":"https://github.com/mastodon/mastodon/commit/94893cf24fc95b32cc7a756262acbe008c20a9d2","tags":["x_refsource_MISC","x_transferred","Patch","web","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-42450","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/42xxx/CVE-2023-42450.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-42450","title":"Mastodon Server-Side Request Forgery vulnerability","description":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.","status":"published","published":"2023-09-19T15:53:39.685Z","modified":"2025-06-18T14:28:57.529Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-918","CWE-113"],"updated_at":"2026-11-02T14:35:17.812395Z"}],"euvd":[{"id":"EUVD-2023-46896","description":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.","status":"published","published":"2023-09-19T15:53:39Z","modified":"2025-06-18T14:28:57Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:20.01453Z"}],"nvd":[{"id":"CVE-2023-42450","description":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.","status":"published","published":"2023-09-19T16:15:12.897Z","modified":"2026-06-17T06:23:51.377Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-113","CWE-918"],"updated_at":"2026-11-02T14:08:29.595868Z"}],"osv":[{"id":"CVE-2023-42450","title":"Mastodon Server-Side Request Forgery vulnerability","description":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.","status":"published","published":"2023-09-19T15:53:39.685Z","modified":"2026-10-28T02:31:01.717815363Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-113","CWE-918"],"updated_at":"2026-11-02T15:44:33.792101Z"},{"id":"BIT-mastodon-2023-42450","title":"Mastodon Server-Side Request Forgery vulnerability","description":"Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.","status":"published","published":"2024-03-06T10:56:05.281Z","modified":"2025-10-15T02:42:26.439396Z","updated_at":"2026-11-02T15:28:32.645004Z"}]}}