CVE-2016-4911

OpenStack Identity Keystone Improper Access Control

4.3 MediumFix available

CVE-2016-4911 is a medium vulnerability (CVSS 4.3) in Keystone Openstack Identity, published June 13, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.40%, the 72nd percentile. Fixed in keystone 9.0.1.

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

1.40%Up 0.2 points since Feb 4, 2022

What each source reports

NVD Score used 4.3

Record: CVE-2016-4911
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:N/I:P/A:N
Weakness: CWE-284
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-4911
Updated: 2026-11-02

EUVDEUVD-2016-0012 No score

Record: EUVD-2016-0012
Updated: 2026-11-03

GitHub AdvisoriesGHSA-f82m-w3p3-cgp3 5.3

OpenStack Identity Keystone Improper Access Control

Record: GHSA-f82m-w3p3-cgp3
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

OSV 4.3

Record: CVE-2016-4911
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2016-4911 4.3

Record: DEBIAN-CVE-2016-4911
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVGHSA-f82m-w3p3-cgp3 5.3

OpenStack Identity Keystone Improper Access Control

Record: GHSA-f82m-w3p3-cgp3
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-284
Updated: 2026-11-02

OSVPYSEC-2016-38 4.3

Record: PYSEC-2016-38
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2016-4911 4.3

Record: UBUNTU-CVE-2016-4911
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

Affected products

keystone openstack identity

Affected packages

Affected packages
Package	Affected	Fixed
`keystone` PyPI	9.0.0 up to 9.0.1	9.0.1
`keystone` Debian:12	before 2:9.0.0-2	2:9.0.0-2
`keystone` Debian:13	before 2:9.0.0-2	2:9.0.0-2
`keystone` Debian:14	before 2:9.0.0-2	2:9.0.0-2

History

History
When	Changed	Sources
2026-11-03	affected
2026-11-03	aliases	EUVD
2026-11-02	created	CVE List, GitHub Advisories, NVD, OSV

References

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