CVE-2021-23365

CVE-2021-23365 is a medium-severity vulnerability in Tyk Tyk-identity-broker with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

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).

Frequently asked questions

What is CVE-2021-23365?
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).
How severe is CVE-2021-23365?
CVE-2021-23365 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-23365 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23365?
CVE-2021-23365 affects Tyk Tyk-identity-broker. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23365?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23365 published?
CVE-2021-23365 was published on 2021-04-26 and last updated on 2026-06-17.

References

Affected products (1)

Other CWE-287 (Improper Authentication) vulnerabilities

Browse all CWE-287 (Improper Authentication) vulnerabilities →