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CVE-2021-23365

29
FAUCET Score

CVE-2021-23365 is a critical authentication bypass vulnerability affecting Tyk Identity Broker versions prior to 1.1.1. This flaw stems from the Go XML parser's inability to maintain XML data integrity during encoding/decoding, allowing attackers to bypass SAML authentication. With a CVSS score of 9.1, this vulnerability is easily exploitable over the network with no user interaction, leading to high confidentiality and integrity impacts. While there is no known active exploitation or public exploit code, the vulnerability has garnered significant community discussion, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.1.1CPE matchmatch criteria
cpe:2.3:a:tyk:tyk-identity-broker:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.01%
Probability of exploitation in next 30 days
EPSS Percentile
59.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0101 is in the 44th 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

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/tyktechnologies/tyk-identity-brokerFixed in: 1.1.1

Vendor Advisories (1)

goGHSA-599h-8wpj-75xjcritical

Authentication Bypass in tyk-identity-broker

Jun 23, 2021

References

github.com / TykTechnologies/tyk-identity-broker/commit/243092965b0f93a95a14cb882b5b9a3df61dd5c0
PatchThird Party Advisory
github.com / TykTechnologies/tyk-identity-broker/commit/46f70420e0911e4e8b638575e29d394c227c75d0
PatchThird Party Advisory
github.com / TykTechnologies/tyk-identity-broker/pull/147
PatchThird Party Advisory
github.com / TykTechnologies/tyk-identity-broker/releases/tag/v1.1.1
Release NotesThird Party Advisory
snyk.io / vuln/SNYK-GOLANG-GITHUBCOMTYKTECHNOLOGIESTYKIDENTITYBROKER-1089720
Third Party Advisory