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TI-2026-26293 Aliases CVE-2026-33942GHSA-rf88-776r-rcq9

Saloon has insecure deserialization in AccessTokenAuthenticator (object injection / RCE)

Priority MEDIUM 44CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00632 50th percentileScored 2026-11-07
Fix Fixed saloon (saloonphp): 4.0.0saloonphp/saloon (Packagist): 4.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
saloonphpsaloonbefore 4.0.04.0.0Patch availableCNA
—saloonphp/saloon (Packagist)before 4.0.04.0.0Patch availableGHSA-rf88-776r-rcq9
  • saloon Vendorsaloonphp Affected before 4.0.0 Fixed in 4.0.0 Patch available CNA
  • saloonphp/saloon (Packagist) Vendor— Affected before 4.0.0 Fixed in 4.0.0 Patch available GHSA-rf88-776r-rcq9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:saloon:saloon:*:*:*:*:*:*:*:*before 4.0.0Vulnerablesaloonphp
  • cpe:2.3:a:saloon:saloon:*:*:*:*:*:*:*:* Versions before 4.0.0 Vulnerable ·saloonphp

Remediation

  • Fix · CNA saloon (saloonphp) Fixed in 4.0.0
  • Fix · GHSA-rf88-776r-rcq9 saloonphp/saloon (Packagist) Fixed in 4.0.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33942
  2. 2026-10-03 Alias added: GHSA-rf88-776r-rcq9
  3. 2026-10-25 EPSS moved to the below the 50th percentile
  4. 2026-10-27 EPSS moved to the 50th–90th percentile

References

Advisory 2

Other 2

  • TI-2026-25611 Saloon has a Fixture Name Path Traversal Vulnerability CVSS 4.0HIGH 8.0
  • TI-2026-25610 Saloon is vulnerable to SSRF and credential leakage via absolute URL in endpoint overriding base URL CVSS 4.0MEDIUM 6.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences