CVE-2026-28802

HIGH EPSS 25.4%
Published Mar 6, 20263mo ago · Modified Mar 9, 20263mo ago
7.7 CVSS 4.0
High
Find Similar
Published Mar 6, 2026 3mo ago
Last Modified Mar 9, 2026 3mo ago

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 Details

Base Score
7.7
Exploitability
—
Impact
—
Vector string
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
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
25.4% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-347

Affected Products 1

VendorProductVersionRange
authlibauthlib*≥1.6.5  –  <1.6.7

References 3

  • github.com https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75
    Patch
  • github.com https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7
    Patch
  • github.com https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75
    Patch
  • github.com https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7
    Patch