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VulnerabilityPublished

CVE-2026-116672: authlib · Insecure Direct Object Reference

Affects authlibSource CVE Database V5

0

Not known to be exploited · CVSS 8.8 High : upgrade to 1.9.1 soon.

Data as of 27 Oct 2026, 17:24 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.9.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade authlib to 1.9.1.

Affected software

ProductAffectedFixed in
authlibauthlibAffected
  • >=0.15 <1.9.1
Fixed in
  • 1.9.1

AI-suggested

Upgrade Authlib to version 1.9.1 or later, where this authorization bypass vulnerability is fixed. No other mitigations are indicated by the vendor advisory.

Description

Authlib versions from 0.15 up to but not including 1.9.1 contain an authorization bypass vulnerability in the ClientConfigurationEndpoint implementations. These implementations improperly verify client permissions by only checking if the target client is editable, without confirming that the request credential belongs to that client. This flaw allows any client with a valid registration access token to read, modify, or delete other clients' registrations. Modifying redirect_uris could lead to authorization code or token interception, and deleting registrations can cause denial of service for affected clients. The vulnerability is fixed in version 1.9.1.

References

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