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    CVE-2026-104056

    Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controlled values rather than endpoint URLs that share the origin of the configured server metadata URL.

    Published:Oct 1, 2026
    Last Modified:Oct 5, 2026
    EPS:Oct 1, 2026
    EPSS Score:0.00097
    CVSS Score:9.8

    Affected Products

    Vendor
    Authlib
    Product
    Authlib

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-111 JSON Hijacking (aka JavaScript Hijacking)
    CAPEC-141 Cache Poisoning
    CAPEC-142 DNS Cache Poisoning
    CAPEC-148 Content Spoofing
    CAPEC-160 Exploit Script-Based APIs
    CAPEC-175 Code Inclusion
    CAPEC-201 Serialized Data External Linking
    CAPEC-21 Exploitation of Trusted Identifiers
    CAPEC-218 Spoofing of UDDI/ebXML Messages
    CAPEC-228 DTD Injection
    CAPEC-251 Local Code Inclusion
    CAPEC-252 PHP Local File Inclusion
    CAPEC-253 Remote Code Inclusion
    CAPEC-263 Force Use of Corrupted Files
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-510 SaaS User Request Forgery
    CAPEC-538 Open-Source Library Manipulation
    CAPEC-549 Local Execution of Code
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-640 Inclusion of Code in Existing Process
    CAPEC-660 Root/Jailbreak Detection Evasion via Hooking
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws
    CAPEC-695 Repo Jacking
    CAPEC-698 Install Malicious Extension
    CAPEC-701 Browser in the Middle (BiTM)
    CAPEC-75 Manipulating Writeable Configuration Files
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-89 Pharming

    Related CVEs

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    CVE-2026-114617 (CVSS 4.2) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, OpenIDMixin.parse_i…
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    CVE-2026-96760 (CVSS 9.8) — Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deseri…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High