CVE-2026-33942 is a critical insecure deserialization vulnerability (CWE-502) affecting the Saloon PHP library, specifically versions prior to 4.0.0. The flaw stems from the use of PHP's unserialize() with allowed_classes => true in AccessTokenAuthenticator, enabling an attacker to inject malicious objects if they can control serialized token data. This can lead to object injection and, in environments with common dependencies, be chained to achieve Remote Code Execution (RCE). The vulnerability carries a CVSS score of 9.8 (CRITICAL) due to its network-based attack vector, low complexity, and potential for complete compromise of confidentiality, integrity, and availability. Currently, there are no known public exploits, it is not on the CISA KEV catalog, and community discussion is limited.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.0.0CPE matchmatch criteria | cpe:2.3:a:saloon:saloon:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
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
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.