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CVE

CVE-2026-3872

Keycloak: Redirect URI validation bypass via ..;/ path traversal in OIDC auth endpoint
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CVE

CVE-2026-3872

Keycloak: Redirect URI validation bypass via ..;/ path traversal in OIDC auth endpoint

A flaw was found in Keycloak. This issue allows an attacker, who controls another path on the same web server, to bypass the allowed path in redirect Uniform Resource Identifiers (URIs) that use a wildcard. A successful attack may lead to the theft of an access token, resulting in information disclosure.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.3
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
C
H
U
7.3
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-3872, https://github.com/keycloak/keycloak/issues/47718, https://github.com/keycloak/keycloak/commit/35a71b00bc856ac402711130f60190d3a24795e7, https://access.redhat.com/errata/RHSA-2026:6475, https://access.redhat.com/errata/RHSA-2026:6476, https://access.redhat.com/errata/RHSA-2026:6477, https://access.redhat.com/errata/RHSA-2026:6478, https://access.redhat.com/security/cve/CVE-2026-3872, https://bugzilla.redhat.com/show_bug.cgi?id=2445988, https://github.com/keycloak/keycloak

Severity

7.3

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.3
EPSS Probability
0.00014%
EPSS Percentile
0.0251%
Introduced Version
25.0.4,24.0.3,0
Fix Available
26.5.7,26.5.7-r0,26.5.6-r4

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