CVE-2026-9689

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 48/100
Published: 2026-05-27 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network No Auth

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: Required
S: Unchanged
C: Low
I: Low
A: None

Description

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
redhat build_of_keycloak -

Bug Bounty Relevance

48 / 100
✓ Network accessible
✓ No authentication

CVSS Score

4.2 / 10.0 v3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS — Exploitation Probability

0.32%
Raw Score 0.003220
Percentile 25.2%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00322
2026-10-28
0.00322

Intelligence Sources

nvd ref →