Keycloak: org.keycloak.protocol.oidc: http parameter pollution in oidc redirect uri allows response parameter duplication - #ghi-604
CVSS score
4.2
EPSS probability
%0.4
Risk score
0.0
Published
4 mo ago
Unfortunately, there is no solution available yet.
Impact on My Inventory
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-9689 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-9689 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Red Hat | Red Hat build of Keycloak 26.4 | View |
| 2 | Red Hat | Red Hat build of Keycloak 26.4 | View |
| 3 | Red Hat | Red Hat build of Keycloak 26.4.14 | View |
| 4 | Red Hat | Red Hat build of Keycloak 26.6 | View |
| 5 | Red Hat | Red Hat build of Keycloak 26.6 | View |
| 6 | Red Hat | Red Hat build of Keycloak 26.6.5 | View |
| 7 | redhat | build of keycloak | View |
| 8 | maven | org.keycloak:keycloak-services | View |
| 9 | maven | org.keycloak:keycloak-services | View |
| 10 | maven | org.keycloak:keycloak-services | View |
| 11 | maven | org.keycloak:keycloak-services | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 4.2 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N | NVD |
| 4.2 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N | CVE CNA |
| 4.2 | CVSS 3.x | — | Vector not published | GitHub Advisory |
| 0.0 | CVSS 4.0 | — | Vector not published | GitHub Advisory |
Patch and Remediation Guide
Solution & Remediation Advisory
Resmî yama doğrulanamadı; geçici azaltım veya workaround mevcut.
Unfortunately, there is no solution available yet.
Unfortunately, there is no solution available yet.
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-9689 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-9689 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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