CVE-2026-33942Network attack vector

Object injection via unrestricted token-state deserialization

Published Mar 26, 2026 · Updated Mar 26, 2026

Deserialization of untrusted data in Saloon before 4.0.0 allows attackers to inject objects through a crafted OAuth token-state string. AccessTokenAuthenticator::unserialize() passes that string to PHP unserialize() with all classes allowed, instantiating supplied gadgets and invoking their magic methods. Exploitation requires control of stored token state and an available gadget chain; object injection is direct, while code execution depends on compatible dependencies.

CVSS severityUnavailable
Unscored
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Saloon before 4.0.0 allows attackers to inject objects through a crafted OAuth token-state string. AccessTokenAuthenticator::unserialize() passes that string to PHP unserialize() with all classes allowed, instantiating supplied gadgets and invoking their magic methods. Exploitation requires control of stored token state and an available gadget chain; object injection is direct, while code execution depends on compatible dependencies.

The record

CVE
CVE-2026-33942
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
Saloon PHP
Product
Saloon
Classifications
CWE-502
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Saloon PHP · Saloonversion=< 4.0.0

Published CVSS scores

8.1GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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