CVE-2026-117656 Assent - Authentication Bypass

Assent 0.1.25 to < 0.3.2 contains an acceptance of extraneous untrusted data vulnerability in Sign in with Apple strategy caused by unverified user parameter merging over verified ID token claims, letting unauthenticated remote attackers impersonate users via the authorization callback user parameter.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.23% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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
Published
31 October 2026
Updated
1 November 2026
Weakness
CWE-290

Vendor fix

Upgrade to version 0.3.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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