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Vulnerability record · CVE-2021-20278 · published 28 May 2021

CVE-2021-20278: Kiali authentication bypass by spoofing vulnerability

Kiali · Kiali

An authentication bypass vulnerability was found in Kiali in versions before 1.31.0 when the authentication strategy `OpenID` is used. When RBAC is enabled, Kiali assumes that some of the token validation is handled by the underlying cluster. When OpenID `implicit flow` is used with RBAC turned off, this token validation doesn't occur, and this allows a malicious user to bypass the authentication.

6.5 CVSS 3.1 Medium EPSS 0.76% · top 45.6% CWE-290 · Authentication bypass by spoofingCWE-287 · Improper authentication
6.5CVSS 3.1 base score, v2 5.8
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An authentication bypass vulnerability was found in Kiali in versions before 1.31.0 when the authentication strategy `OpenID` is used. When RBAC is enabled, Kiali assumes that some of the token validation is handled by the underlying cluster. When OpenID `implicit flow` is used with RBAC turned off, this token validation doesn't occur, and this allows a malicious user to bypass the authentication.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1937171 Issue TrackingPatchThird Party Advisory
https://kiali.io/news/security-bulletins/kiali-security-002/ Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1937171 Issue TrackingPatchThird Party Advisory
https://kiali.io/news/security-bulletins/kiali-security-002/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-20278), CISA KEV, FIRST EPSS (scores of 2026-10-15). This page is refreshed as NVD updates the record.