CVE-2026-18967
Low
No strong exploitation signal.
CVSS base
6.4
MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS — probability of exploitation (30 days)
0.1%
4.1th percentile
CISA KEV
Not listed
Weakness / dates
CWE-294
Published 2026-08-06 · modified 2026-08-10
CVSS breakdown
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
| Attack Vector | A | Adjacent |
| Attack Complexity | H | High |
| Privileges Required | N | None |
| User Interaction | R | Required |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | N | None |
Timeline
- 2026-08-06 — Published (NVD)
- 2026-08-10 — Last modified (NVD)
Description
A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused assertion to replay it multiple times. Successful exploitation could allow an attacker to hijack a user's session and gain unauthorized access to the system as that user.