CVE-2026-114618
Authlib is a Python library which builds OAuth and OpenID Connect servers
- Risk score
- 53/100
- CVSS
- 6.8 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 22 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 …
- Affected
- See advisory
- Fix
- Upgrade the product to 1.9.0 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 6.8 medium
- On your watchlist: python
References
Original description
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.
Last activity 22 Oct 2026. Patch Forecast updates every hour.