EUVD-2026-16070Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Saloon PHP library versions prior to 4.0.0 contain a PHP object injection vulnerability in the AccessTokenAuthenticator::unserialize() method, which unsafely deserializes OAuth token state using unserialize() with allowed_classes set to true. An attacker who can control the serialized token string-such as by overwriting a cached token file or injecting malicious data-can supply a crafted serialized gadget object that executes arbitrary code through PHP magic methods during deserialization. In environments with common dependencies like Monolog present, this vulnerability can be reliably chained to achieve remote code execution (RCE), making it a critical threat to any API integration or SDK built on vulnerable Saloon versions.
Technical ContextAI
Saloon is a PHP library (CPE: cpe:2.3:a:saloonphp:saloon) designed to simplify OAuth and API integrations. The vulnerability stems from unsafe deserialization practices in the AccessTokenAuthenticator class, which falls under CWE-502 (Deserialization of Untrusted Data). The root cause is the use of PHP's native unserialize() function with allowed_classes set to true, which permits instantiation of any PHP class present in the application's dependency tree. When an attacker-controlled serialized string is passed to unserialize(), PHP instantiates arbitrary objects and triggers their magic methods (__wakeup, __construct, __destruct, etc.), allowing gadget chains from common libraries (particularly Monolog) to execute system commands. This is a well-known attack vector in PHP security, especially in frameworks and libraries that handle persistent state like authentication tokens.
RemediationAI
Upgrade Saloon to version 4.0.0 or later immediately. Version 4.0.0 removes PHP serialization from the AccessTokenAuthenticator class entirely, requiring developers to manually implement and manage token storage and restoration logic, which eliminates the attack surface. Until patching is complete, implement defense-in-depth: (1) restrict file system permissions on cache directories to prevent unauthorized writes, (2) disable or isolate Monolog and other gadget-rich dependencies if not actively used, (3) validate token cache integrity using cryptographic signatures (HMAC-SHA256) before deserialization, and (4) run Saloon-dependent code in a sandbox or container with restricted capabilities. Review the upgrade guide at https://docs.saloon.dev/upgrade/upgrading-from-v3-to-v4 for migration steps to the new manual token management pattern.
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Same weakness CWE-502 – Deserialization of Untrusted Data
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External POC / Exploit Code
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