What’s Vulnerable › Vulnerabilities

CVE-2026-42999

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-28 · updated 2026-10-26
• Weakness: CWE-863

Description

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone RBAC policy enforcer in enforce_call unconditionally merges the raw JSON request body into the policy enforcement dictionary via policy_dict.update(json_input.copy()), overwriting trusted target data that was previously set from database lookups. Because flask.request.get_json is called with force=True, this works regardless of Content-Type or HTTP method. Any authenticated user can inject arbitrary policy target attributes (e.g., user_id, project_id) into the request body to bypass RBAC checks and perform unauthorized operations on resources belonging to other users or projects. This was introduced in commit 5ea59f52 (Rocky/14.0.0).

Affected products

• OpenStack Keystone: from 14.0.0 before 27.0.2; from 28.0.0 before 28.0.2; from 29.0.0 before 29.0.2 — fixed in 27.0.2, 28.0.2, 29.0.2

How to fix

Upgrade to a fixed version: OpenStack Keystone 27.0.2, 28.0.2, 29.0.2. Check the vendor advisory for mitigations.

References

• https://bugs.launchpad.net/keystone/+bug/2148398
• https://security.openstack.org/ossa/OSSA-2026-015.html
• https://access.redhat.com/security/cve/CVE-2026-42999
• https://bugzilla.redhat.com/show_bug.cgi?id=2482840
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42999.json

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