CVE-2020-26244

Name: CVE-2020-26244
Creator: NVD / NIST
Published: 2020-12-02T20:15:13.43+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2020-26244 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.8/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.81%

52.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Python Openid Connect Project	Python Openid Connect	< 1.2.1

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

Timeline

Published: Dec 2, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26244?

How severe is CVE-2020-26244?

CVE-2020-26244 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26244?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26244?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST