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CVE-2026-3872— Keycloak: keycloak: information disclosure due to redirect_uri validation bypass

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于使用通配符的重定向URI路径绕过，可能导致攻击者窃取访问令牌，造成信息泄露。

CVSS 7.3 · High EPSS 0.59% · P46

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.2 26.2.15-1< * unaffected
26.2-18< * unaffected
26.2-18< * unaffected
Red Hat Red Hat build of Keycloak 26.2.15 any unaffected
Red Hat Red Hat build of Keycloak 26.4 26.4.11-1< * unaffected
26.4-14< * unaffected
26.4-14< * unaffected
Red Hat Red Hat build of Keycloak 26.4.11 any unaffected
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I. Basic Information for CVE-2026-3872

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak: information disclosure due to redirect_uri validation bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于使用通配符的重定向URI路径绕过，可能导致攻击者窃取访问令牌，造成信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.2 26.2.15-1 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-18 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-18 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2.15 - cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.11-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.11 - cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-3872

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III. Intelligence Information for CVE-2026-3872

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Vendor Advisories for CVE-2026-3872 (6)

Same Patch Batch · Red Hat · 2026-04-02 · 5 CVEs total

CVE-2026-4636 8.1 HIGH Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized acce
CVE-2026-4634 7.5 HIGH Keycloak: keycloak: denial of service via excessive processing of openid connect scope par
CVE-2026-4282 7.4 HIGH Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseob
CVE-2026-4325 5.3 MEDIUM Keycloak: keycloak: replay of action tokens via improper handling of single-use entries

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.2
Same vendor: Red Hat
Same weakness: CWE-601

V. Comments for CVE-2026-3872

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