CVE-2026-33942 json
Saloon has insecure deserialization in AccessTokenAuthenticator (object injection / RCE)
published 7mo ago modified 4mo ago also GHSA-rf88-776r-rcq9 , EUVD-2026-16070
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
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.
Patch / fix
- packagist saloonphp/saloon 4.0.0
- saloon saloon 4.0.0
Is CVE-2026-33942 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 7mo ago
Exploit prediction
0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.1 | 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 |
| CNA | 4.0 | 8.1 | 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 |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | saloonphp/saloon | <4.0.0 |
4.0.0 |
Affected products
- saloonphp saloon
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
github.com
/saloonphp/saloon/security/advisories/GHSA-rf88-776r-rcq9
web, vendor-advisory
-
docs.saloon.dev
/upgrade/upgrading-from-v3-to-v4
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-33942
advisory
-
github.com
/saloonphp/saloon
package
Sources
- CVE List CVE-2026-33942
- GitHub Advisory GHSA-rf88-776r-rcq9
- NVD CVE-2026-33942
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