{"id":"CVE-2024-28121","state":"PUBLISHED","title":"Reflex arbitrary method call in stimulus_reflex","description":"stimulus_reflex is a system to extend the capabilities of both Rails and Stimulus by intercepting user interactions and passing them to Rails over real-time websockets. In affected versions more methods than expected can be called on reflex instances. Being able to call some of them has security implications. To invoke a reflex a websocket message of the following shape is sent: `\\\"target\\\":\\\"[class_name]#[method_name]\\\",\\\"args\\\":[]`. The server will proceed to instantiate `reflex` using the provided `class_name` as long as it extends `StimulusReflex::Reflex`. It then attempts to call `method_name` on the instance with the provided arguments. This is problematic as `reflex.method method_name` can be more methods that those explicitly specified by the developer in their reflex class. A good example is the instance_variable_set method. This vulnerability has been patched in versions 3.4.2 and 3.5.0.rc4. Users unable to upgrade should: see the backing GHSA advisory for mitigation advice.","publishedAt":"2024-03-12T19:44:29.591Z","updatedAt":"2025-02-13T17:47:15.887Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["stimulusreflex stimulus_reflex"],"affected":[{"vendor":"stimulusreflex","product":"stimulus_reflex","versions":[{"version":">= 3.5.0.rc1, < 3.5.0.rc4","status":"affected"},{"version":"< 3.4.2","status":"affected"}]}],"references":["https://github.com/stimulusreflex/stimulus_reflex/security/advisories/GHSA-f78j-4w3g-4q65","https://github.com/stimulusreflex/stimulus_reflex/commit/538582d240439aab76066c72335ea92096cd0c7f","https://github.com/stimulusreflex/stimulus_reflex/blob/0211cad7d60fe96838587f159d657e44cee51b9b/app/channels/stimulus_reflex/channel.rb#L83","https://github.com/stimulusreflex/stimulus_reflex/releases/tag/v3.4.2","https://github.com/stimulusreflex/stimulus_reflex/releases/tag/v3.5.0.rc4","http://seclists.org/fulldisclosure/2024/Mar/16"],"weaknesses":["CWE-470"],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/28xxx/CVE-2024-28121.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2024-28121","state":"PUBLISHED","datePublished":"2024-03-12T19:44:29.591Z","dateUpdated":"2025-02-13T17:47:15.887Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2024-03-04T14:19:14.060Z"},"containers":{"cna":{"title":"Reflex arbitrary method call in stimulus_reflex","descriptions":[{"lang":"en","value":"stimulus_reflex is a system to extend the capabilities of both Rails and Stimulus by intercepting user interactions and passing them to Rails over real-time websockets. In affected versions more methods than expected can be called on reflex instances. Being able to call some of them has security implications. To invoke a reflex a websocket message of the following shape is sent: `\\\"target\\\":\\\"[class_name]#[method_name]\\\",\\\"args\\\":[]`. The server will proceed to instantiate `reflex` using the provided `class_name` as long as it extends `StimulusReflex::Reflex`. It then attempts to call `method_name` on the instance with the provided arguments. This is problematic as `reflex.method method_name` can be more methods that those explicitly specified by the developer in their reflex class. A good example is the instance_variable_set method. This vulnerability has been patched in versions 3.4.2 and 3.5.0.rc4. 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