CVE-2026-33942

CVE-2026-33942 · Saloon has insecure deserialization in AccessTokenAuthenticator (object injection / RCE)

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Saloon is a PHP library that gives users tools to build API integrations and SDKs. Versions prior to 4.0.0 used PHP's unserialize() in AccessTokenAuthenticator::unserialize() to restore OAuth token state from cache or storage, with allowed_classes => true. An attacker who can control the serialized string (e.g. by overwriting a cached token file or via another injection) can supply a serialized "gadget" object. When unserialize() runs, PHP instantiates that object and runs its magic methods (__wakeup, __destruct, etc.), leading to object injection. In environments with common dependencies (e.g. Monolog), this can be chained to remote code execution (RCE). The fix in version 4.0.0 removes PHP serialization from the AccessTokenAuthenticator class requiring users to store and resolve the authenticator manually.

CVSS 8.1 · High · EPSS 0.6% · Fix available

Published

2026-03-26T00:27:23.776Z

Updated

2026-03-28T02:06:07.913Z

Stack: php

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