Is CVE-2026-28802 actively exploited?

CVE-2026-28802 has no public evidence of in-the-wild exploitation as of 2026-03-09.

What is the CVSS score for CVE-2026-28802?

CVE-2026-28802 has a CVSS score of 7.7 (HIGH severity). Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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.

How do I patch CVE-2026-28802?

Patch guidance is available from authlib security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-28802.

Fix CVE-2026-28802 - HIGH authlib authlib

Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.

CVSS Metrics

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-347

Metadata

Primary Vendor: AUTHLIB
Published: 3/6/2026
Last Modified: 3/9/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-28802

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary