CVE-2021-27582

Name: CVE-2021-27582
Creator: NVD / NIST
Published: 2021-02-23T18:15:14.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 2.22%

Last modified Jun 17, 2026

CVE-2021-27582 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. org/mitre/oauth2/web/OAuthConfirmationController.java in the OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Mass Assignment (aka Autobinding) vulnerability. This arises due to unsafe usage of the @ModelAttribute annotation during the OAuth authorization flow, in which HTTP request parameters affect an authorizationRequest.. EPSS estimates a 2.22% chance of exploitation in the next 30 days.

Description

org/mitre/oauth2/web/OAuthConfirmationController.java in the OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Mass Assignment (aka Autobinding) vulnerability. This arises due to unsafe usage of the @ModelAttribute annotation during the OAuth authorization flow, in which HTTP request parameters affect an authorizationRequest.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

2.22%

80.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1321

Affected Software

Vendor	Product	Versions
Mitreid	Connect	<= 1.3.3

References

http://agrrrdog.blogspot.com/2017/03/autobinding-vulns-and-spring-mvc.htmlExploit, Third Party Advisory
https://github.com/mitreid-connect/OpenID-Connect-Java-Spring-Server/commit/7eba3c12fed82388f917e8dd9b73e86e3a311e4cPatch, Third Party Advisory
https://portswigger.net/research/hidden-oauth-attack-vectorsExploit, Third Party Advisory
http://agrrrdog.blogspot.com/2017/03/autobinding-vulns-and-spring-mvc.htmlExploit, Third Party Advisory
https://github.com/mitreid-connect/OpenID-Connect-Java-Spring-Server/commit/7eba3c12fed82388f917e8dd9b73e86e3a311e4cPatch, Third Party Advisory
https://portswigger.net/research/hidden-oauth-attack-vectorsExploit, Third Party Advisory

Timeline

Published: Feb 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27582?

How severe is CVE-2021-27582?

CVE-2021-27582 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 2.22% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27582?

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-2021-27582?

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

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Source: NVD / NIST