CVE-2016-4911

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-06-13 · updated 2026-06-17
Weakness: CWE-284

Description

The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 (mitaka) allows remote authenticated users to prevent revocation of a chain of tokens and bypass intended access restrictions by rescoping a token.

Affected products

keystone Openstack Identity: 9.0.0.0-rc1, 9.0.0.0-rc2, 9.0.0.0-rc3

References

http://www.openwall.com/lists/oss-security/2016/05/17/10
http://www.openwall.com/lists/oss-security/2016/05/17/11
http://www.securityfocus.com/bid/90728
https://bugs.launchpad.net/keystone/+bug/1577558
https://review.openstack.org/#/c/311886/
https://security.openstack.org/ossa/OSSA-2016-008.html
http://www.openwall.com/lists/oss-security/2016/05/17/10
http://www.openwall.com/lists/oss-security/2016/05/17/11
http://www.securityfocus.com/bid/90728
https://bugs.launchpad.net/keystone/+bug/1577558
https://review.openstack.org/#/c/311886/
https://security.openstack.org/ossa/OSSA-2016-008.html

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