CVE-2026-114618
MEDIUM
6,8
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: none
Description
AI Translation Available
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 7523 JWTBearerGrant.get_audiences() returns an empty list, causing JWTBearerGrant.verify_claims() to require only that an aud claim exists without matching the current authorization server. An attacker holding a legitimate assertion for another service can present it to a server that shares the signing key and uses the default grant, obtaining an access token across a trust boundary. Implementations that override get_audiences() with the server's valid audience identifiers are not affected. This issue is fixed in version 1.9.0.
287
Improper Authentication
DraftCommon Consequences
Security Scopes Affected:
Integrity
Confidentiality
Availability
Access Control
Potential Impacts:
Read Application Data
Gain Privileges Or Assume Identity
Execute Unauthorized Code Or Commands
Applicable Platforms
Technologies:
Not Technology-Specific, Web Based, ICS/OT
1188
Initialization of a Resource with an Insecure Default
IncompleteCommon Consequences
Security Scopes Affected:
Other
Potential Impacts:
Varies By Context
Applicable Platforms
All platforms may be affected
https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884bae…
https://github.com/authlib/authlib/pull/945
https://github.com/authlib/authlib/releases/tag/v1.9.0
https://github.com/authlib/authlib/security/advisories/GHSA-fch4-3c6x-j4gc