What’s Vulnerable › Vulnerabilities

CVE-2015-7546

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-02-03 · updated 2026-06-17
• Weakness: CWE-522

Description

The identity service in OpenStack Identity (Keystone) before 2015.1.3 (Kilo) and 8.0.x before 8.0.2 (Liberty) and keystonemiddleware (formerly python-keystoneclient) before 1.5.4 (Kilo) and Liberty before 2.3.3 does not properly invalidate authorization tokens when using the PKI or PKIZ token providers, which allows remote authenticated users to bypass intended access restrictions and gain access to cloud resources by manipulating byte fields within a revoked token.

Affected products

• OpenStack Keystone: from 8.0.0 before 8.0.2; from 2015.1.0 through 2015.1.2 — fixed in 8.0.2
• OpenStack keystonemiddleware: from 1.5.0 through 1.5.3; from 1.6.0 through 2.3.2
• Oracle Corporation Solaris Operating System: 11.3

How to fix

Upgrade to a fixed version: OpenStack Keystone 8.0.2. Check the vendor advisory for mitigations.

References

• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securityfocus.com/bid/80498
• https://bugs.launchpad.net/keystone/+bug/1490804
• https://security.openstack.org/ossa/OSSA-2016-005.html
• https://wiki.openstack.org/wiki/OSSN/OSSN-0062
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securityfocus.com/bid/80498
• https://bugs.launchpad.net/keystone/+bug/1490804
• https://security.openstack.org/ossa/OSSA-2016-005.html
• https://wiki.openstack.org/wiki/OSSN/OSSN-0062

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