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CVE-2021-26715

27
FAUCET Score

CVE-2021-26715 is a critical Server-Side Request Forgery (SSRF) vulnerability affecting MITREid Connect through version 1.3.3, stemming from unsafe handling of the logo_uri parameter during Dynamic Client Registration. This allows unauthenticated attackers to force the vulnerable server to make HTTP requests to internal network addresses, potentially leading to data exfiltration, network boundary bypasses, or attacks on other internal hosts. With a CVSS score of 9.1 (CRITICAL) and low attack complexity, the potential impact is high confidentiality and integrity compromise. While no active exploitation, public exploits, or significant community discussion have been observed, the vulnerability remains a significant risk.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.3.3CPE matchmatch criteria
cpe:2.3:a:mitreid:connect:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.49%
Probability of exploitation in next 30 days
EPSS Percentile
71.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0149 is in the 58th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

mavenGHSA-792r-mh2q-p8qphigh

Server Side Request Forgery (SSRF) in org.mitre:openid-connect-server

May 13, 2021

References

github.com / mitreid-connect/OpenID-Connect-Java-Spring-Server/releases
Third Party Advisory
portswigger.net / research/hidden-oauth-attack-vectors
ExploitThird Party Advisory