OpenStack Keystone up to 27.0.1/28.0.1/29.0.1 Authentication Plugin /v3/auth/tokens handle_scoped_token expires_at authorization

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in OpenStack Keystone up to 27.0.1/28.0.1/29.0.1. This issue affects the function handle_scoped_token of the file /v3/auth/tokens of the component Authentication Plugin Handler. This manipulation of the argument expires_at causes authorization. This vulnerability is registered as CVE-2026-44394. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenStack Keystone up to 27.0.1/28.0.1/29.0.1. It has been declared as problematic. Affected by this vulnerability is the function handle_scoped_token of the file /v3/auth/tokens of the component Authentication Plugin Handler. The manipulation of the argument expires_at with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone federated token rescoping mechanism does not propagate the original token's expiry to the newly issued token. When a federated user rescopes a token via POST /v3/auth/tokens, the handle_scoped_token() function in the mapped authentication plugin returns response data without an expires_at value. The token provider falls back to issuing a token with a fresh default TTL. By rescoping repeatedly before each token expires, a user can maintain access indefinitely, bypassing operator-configured token lifetime policies. This is a variant of CVE-2012-3426. Only deployments using federated identity (SAML2, OpenID Connect) are affected.

The advisory is shared at bugs.launchpad.net. This vulnerability is known as CVE-2026-44394 since 05/05/2026. The exploitation appears to be difficult. The attack can be launched remotely. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 321365 (Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : OpenStack Keystone vulnerabilities (USN-8433-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 27.0.2, 28.0.2 or 29.0.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (321365). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.0
CNA Vector (MITRE): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321365
Nessus Name: Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : OpenStack Keystone vulnerabilities (USN-8433-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Keystone 27.0.2/28.0.2/29.0.2

Timelineinfo

05/05/2026 CVE reserved
05/28/2026 +23 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
06/19/2026 +22 days VulDB entry last update

Sourcesinfo

Vendor: openstack.org

Advisory: bugs.launchpad.net
Status: Confirmed

CVE: CVE-2026-44394 (🔒)
GCVE (CVE): GCVE-0-2026-44394
GCVE (VulDB): GCVE-100-366865

Entryinfo

Created: 05/28/2026 22:24
Updated: 06/19/2026 18:01
Changes: 05/28/2026 22:24 (33), 05/28/2026 22:25 (34), 06/19/2026 18:01 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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