What’s Vulnerable › Vulnerabilities

CVE-2021-26715

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-25 · updated 2026-06-17
• Weakness: CWE-918

Description

The OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Server Side Request Forgery (SSRF) vulnerability. The vulnerability arises due to unsafe usage of the logo_uri parameter in the Dynamic Client Registration request. An unauthenticated attacker can make a HTTP request from the vulnerable server to any address in the internal network and obtain its response (which might, for example, have a JavaScript payload for resultant XSS). The issue can be exploited to bypass network boundaries, obtain sensitive data, or attack other hosts in the internal network.

Affected products

• Mitreid Connect: through 1.3.3

References

• https://github.com/mitreid-connect/OpenID-Connect-Java-Spring-Server/releases
• https://portswigger.net/research/hidden-oauth-attack-vectors
• https://github.com/mitreid-connect/OpenID-Connect-Java-Spring-Server/releases
• https://portswigger.net/research/hidden-oauth-attack-vectors

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