8.1

CVE-2026-44394: openstack keystone Incorrect Authorization

CVSS: 8.1v3.1HighAnalyzed
AliasesGHSA-whqr-fgm5-x77qPYSEC-2026-603UBUNTU-CVE-2026-44394
Published 28-05-2026Last modified 28-05-2026
Open JSON

Vulnerability summary

CVE-2026-44394 is a high (CVSS 8.1) Incorrect Authorization vulnerability in openstack keystone. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
42/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
0.32%
0%100%
Low · +0.07 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-V75M-8572-4J65USN-8433-1

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 28-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.32%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

+0.07 pp

From 0.25% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.32%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugs.launchpad.net)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Chainguard6 products
  • openstack-keystone-2025.1< 27.0.1_git20260618-r6
  • openstack-keystone-2025.1-fips< 27.0.1_git20260618-r7
  • openstack-keystone-2025.2< 28.0.1_git20260618-r5
  • openstack-keystone-2025.2-fips< 28.0.1_git20260618-r5
  • openstack-keystone-2026.1< 29.0.1_git20260616-r6
Debian1 product
  • keystone< 2:22.0.2-0+deb12u3 | < 2:27.0.0-3+deb13u4 | < 2:29.0.1-2
Openstack1 product
  • keystone≥ 14.0.0, < 27.0.2 | ≥ 28.0.0, < 28.0.2 | ≥ 29.0.0, < 29.0.2
PyPI1 product
  • keystone≥ 14.0.0, < 27.0.2 | ≥ 28.0.0, < 28.0.2 | ≥ 29.0.0, < 29.0.2
Ubuntu1 product
  • keystoneAll versions (No fix recorded) | < 2:21.0.1-0ubuntu2.4 | < 2:25.0.0-0ubuntu1.4 | < 2:28.0.0-0ubuntu1.3 | < 2:29.0.0-0ubuntu1.2

5 vendors · 10 products

References

11 links
Show all 11 references