What’s Vulnerable › Vulnerabilities

CVE-2021-23365: Authentication Bypass

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-26 · updated 2026-06-17
• Weakness: CWE-287

Description

The package github.com/tyktechnologies/tyk-identity-broker before 1.1.1 are vulnerable to Authentication Bypass via the Go XML parser which can cause SAML authentication bypass. This is because the XML parser doesn’t guarantee integrity in the XML round-trip (encoding/decoding XML data).

Affected products

• github.com/TykTechnologies/tyk-identity-broker: before 1.1.1 — fixed in 1.1.1

How to fix

Upgrade to a fixed version: github.com/TykTechnologies/tyk-identity-broker 1.1.1. Check the vendor advisory for mitigations.

References

• https://github.com/TykTechnologies/tyk-identity-broker/commit/243092965b0f93a95a14cb882b5b9a3df61dd5c0
• https://github.com/TykTechnologies/tyk-identity-broker/commit/46f70420e0911e4e8b638575e29d394c227c75d0
• https://github.com/TykTechnologies/tyk-identity-broker/pull/147
• https://github.com/TykTechnologies/tyk-identity-broker/releases/tag/v1.1.1
• https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMTYKTECHNOLOGIESTYKIDENTITYBROKER-1089720
• https://github.com/TykTechnologies/tyk-identity-broker/commit/243092965b0f93a95a14cb882b5b9a3df61dd5c0
• https://github.com/TykTechnologies/tyk-identity-broker/commit/46f70420e0911e4e8b638575e29d394c227c75d0
• https://github.com/TykTechnologies/tyk-identity-broker/pull/147
• https://github.com/TykTechnologies/tyk-identity-broker/releases/tag/v1.1.1
• https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMTYKTECHNOLOGIESTYKIDENTITYBROKER-1089720

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