Incorrect Behavior Order: Validate Before Canonicalize in guzzle - CVE-2026-59883
Published: July 30, 2026
Vulnerability identifier: #VU140088
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-59883
CWE-ID: CWE-180
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
guzzle
guzzle
Detailed vulnerability description
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to noncanonical cookie domain keeps subdomain scope. A remote attacker can disclose session cookies to attacker-controlled subdomains or inject malicious cookies on the system.
How to mitigate CVE-2026-59883
Install updates from vendor's website.