CVE-2024-28121
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.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.8
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS probability
- 1.55%
- CWE
- CWE-470
- Published
- 2024-03-12
- Last modified
- 2026-03-13
Affected products
- stimulusreflex stimulus_reflex
- stimulusreflex stimulus_reflex
Weakness type
Related vulnerabilities
- CVE-2026-41871 — Apache Nutch: Unauthenticated reflection-based job execution in Nutch Server (Nutch REST API)
- CVE-2026-41870 — Apache Nutch: Unauthenticated remote code execution (RCE) via JEXL injection in Nutch Server (Nutch REST API)
- CVE-2026-58400 — GeoNetwork vulnerable to Remote Code Execution via unsafe Saxon XSLT processor configuration in formatter
- CVE-2026-19032 — jackson-databind resolves attacker-controlled URI schemes when deserializing java.nio.file.Path
- CVE-2026-55559 — Yamcs: Remote Code Execution via instance-template argument YAML injection (createInstance)
- CVE-2026-82078 — PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector
- CVE-2026-54614 — DebugKit: MailPreview contains unsafe reflection
- CVE-2026-79784 — Vocos through 0.1.0 Arbitrary Code Execution via Unrestricted class_path in Model Configuration