Is this vulnerability remotely exploitable over the network?

It can be, depending on how serialized token data is stored and controlled. If an attacker can influence the storage backing the token cache (directly or via an injection flaw in another component), they may be able to exploit this purely through network interactions with the application.

Does an attacker need authenticated access to exploit this?

Not necessarily. The key requirement is the ability to control or overwrite the serialized token data that `AccessTokenAuthenticator::unserialize()` consumes. In some deployments this might require authenticated access; in others, misconfigured file permissions, shared caches, or secondary vulnerabilities could provide that capability without authentication.

What is the safest general fix pattern?

Remove PHP object serialization from authentication flows altogether. Store OAuth tokens as simple, structured data (such as JSON or associative arrays) and reconstruct authenticator instances manually from those primitives rather than deserializing full objects.

Severity:

CRITICAL RISK

(9.8)

PHP Object Injection via Unsafe Deserialization (CWE-502) in Saloon AccessTokenAuthenticator

CVE-2026-33942

Published:

Mar 25, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution / PHP Object Injection

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution / PHP Object Injection

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

PHP Object Injection via Unsafe Deserialization (CWE-502) in Saloon AccessTokenAuthenticator

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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