CVE-2020-26244
2) JWA `none` algorithm was allowed in all flows.
Does this matter?
Lower severity and a low EPSS score (0.83%). Track it; it rarely justifies an emergency change on its own.
Description
Python oic is a Python OpenID Connect implementation. In Python oic before version 1.2.1, there are several related cryptographic issues affecting client implementations that use the library. The issues are: 1) The IdToken signature algorithm was not checked automatically, but only if the expected algorithm was passed in as a kwarg. 2) JWA `none` algorithm was allowed in all flows. 3) oic.consumer.Consumer.parse_authz returns an unverified IdToken. The verification of the token was left to the discretion of the implementator. 4) iat claim was not checked for sanity (i.e. it could be in the future). These issues are patched in version 1.2.1.
- CVSS 3.1
- 6.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.83% probability · 57th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-325, CWE-347
- Affected
- python openid connect project/python openid connect
- Source
- security-advisories@github.com
EPSS 0.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498Patch, Third Party Advisory
- https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1Third Party Advisory
- https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfgThird Party Advisory
- https://pypi.org/project/oic/Product, Vendor Advisory
- https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498Patch, Third Party Advisory
- https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1Third Party Advisory
- https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfgThird Party Advisory
- https://pypi.org/project/oic/Product, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.