Insufficient verification of data authenticity in Symfony - CVE-2026-45069
Published: May 21, 2026
Vulnerability identifier: #VU132074
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-2026-45069
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: SensioLabs
Affected software:
Symfony
Symfony
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass JWT claim validation.
The vulnerability exists due to insufficient verification of data authenticity in OidcTokenHandler::verifyClaims() when processing a validly signed bearer JWT missing required claims. A remote attacker can supply a validly signed JWT that omits the aud, iss, and exp claims to bypass JWT claim validation.
How to mitigate CVE-2026-45069
Install security update from vendor's website.