GHSA-R33W-FG8J-9C94

Description

MagicLink stores serialized action objects in the magic_links.action database column and deserializes them without integrity validation or class allowlisting in src/MagicLink.php and src/Actions/ResponseAction.php. An attacker with the ability to manipulate database records (e.g., via SQL injection or compromised admin access) could inject malicious serialized objects containing arbitrary closures, leading to Remote Code Execution (RCE) when the magic link is visited.

Resolution

The vulnerability has been mitigated through HMAC-signed serialization using the application key, class allowlisting restricted to ActionAbstract subclasses and framework classes, strict type validation preventing arbitrary object storage, and backward compatibility support for legacy data via allowed_classes in unserialize(). Implementation includes a new Serializable security class with signing/verification, refactored getter/setter methods in MagicLink.

Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect. Typical impact: arbitrary code execution or logic abuse.

GHSA-R33W-FG8J-9C94 has a CVSS score of 8.8 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.25.1); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is GHSA-R33W-FG8J-9C94? GHSA-R33W-FG8J-9C94 is a high-severity insecure deserialization vulnerability in cesargb/laravel-magiclink (composer), affecting versions >= 2.0.0, < 2.25.1. It is fixed in 2.25.1. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.
2. How severe is GHSA-R33W-FG8J-9C94? GHSA-R33W-FG8J-9C94 has a CVSS score of 8.8 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of cesargb/laravel-magiclink are affected by GHSA-R33W-FG8J-9C94? cesargb/laravel-magiclink (composer) versions >= 2.0.0, < 2.25.1 is affected.
4. Is there a fix for GHSA-R33W-FG8J-9C94? Yes. GHSA-R33W-FG8J-9C94 is fixed in 2.25.1. Upgrade to this version or later.
5. Is GHSA-R33W-FG8J-9C94 exploitable, and should I be worried? Whether GHSA-R33W-FG8J-9C94 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether GHSA-R33W-FG8J-9C94 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix GHSA-R33W-FG8J-9C94? Upgrade cesargb/laravel-magiclink to 2.25.1 or later.