CVE-2026-9689

Low

No strong exploitation signal.

CVSS base

4.2 MEDIUM

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

EPSS — probability of exploitation (30 days)

0.3%

25.4th percentile

CISA KEV

Not listed

Weakness / dates

CWE-1288

Published 2026-05-27 · modified 2026-08-20

CVSS breakdown

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

Attack Vector	N	Network
Attack Complexity	H	High
Privileges Required	N	None
User Interaction	R	Required
Scope	U	Unchanged
Confidentiality	L	Low
Integrity	L	Low
Availability	N	None

Timeline

2026-05-27 — Published (NVD)
2026-08-20 — Last modified (NVD)

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.

Affected

redhat

References

Official: NVD · CVE.org