CVE-2021-23365
CWE-287Published: April 26, 2021· Updated: Jun 17, 2026
Official 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).
Risk Analysis
The tyk-identity-broker is vulnerable to a SAML authentication bypass due to improper handling of XML data by the Go XML parser. This critical flaw allows attackers to bypass authentication mechanisms, posing a significant risk to system security.
No public exploit is known, and the vulnerability is not in the KEV catalog. It is remotely exploitable with low attack complexity.
Upgrade to tyk-identity-broker version 1.1.1 or later to resolve the authentication bypass issue.
Technical Analysis
CVE-2021-23365 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.
From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (10)
Quick Facts
Related CVEs (CWE-287)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-23365 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts