CVE-2021-26715: The OpenID Connect server implementation for MITREid Connect through 1.3.3 contains a Server Side Request Forg

Q: How do I fix CVE-2021-26715?

connect: upgrade to newer than 1.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2021-26715 being exploited?

CVE-2021-26715 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-26715 affect?

CVE-2021-26715 affects connect. Severity is critical (CVSS 9.1). 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 Registratio

Q: How urgent is CVE-2021-26715?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2021-26715 is a critical-severity flaw (CVSS 9.1) affecting connect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-918
Published	2021-03-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mitreid

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-25 09:15 UTCPublished CVE record published
2026-06-17 03:43 UTCUpdated Record last modified

mitreid connect UPGRADE

Affected: <= 1.3.3

Fixed in: newer than 1.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy connect || rpm -q connect || connect --version

2. UPGRADE to newer than 1.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade connect

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade connect

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-26715?

connect: upgrade to newer than 1.3.3. Exact commands for each OS are on this page.

Is CVE-2021-26715 being exploited?

CVE-2021-26715 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-26715 affect?

CVE-2021-26715 affects connect. Severity is critical (CVSS 9.1). 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 Registratio

How urgent is CVE-2021-26715?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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