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CVE-2026-42998· NVD / CVE Program· CNA mitre

An issue was discovered in OpenStack Keystone before 29.0.2.

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
May 28, 2026
Updated
Jun 17, 2026
EPSS
0.4% · 33th percentile
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Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.8
CNA · mitre
6.0
2.8 point gap

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
openstackkeystone

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • openstack keystone14.0.0 and later · before 27.0.2
  • openstack keystone28.0.0 and later · before 28.0.2
  • openstack keystone29.0.0 and later · before 29.0.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mitre). Independent of NVD's CPE analysis and usually ahead of it.

  • OpenStack Keystone

    • 14.0.0 and later · before 27.0.2affected · semver
    • 28.0.0 and later · before 28.0.2affected · semver
    • 29.0.0 and later · before 29.0.2affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12keystonebefore 2:22.0.2-0+deb12u32:22.0.2-0+deb12u3
Debian:13keystonebefore 2:27.0.0-3+deb13u42:27.0.0-3+deb13u4
Debian:14keystonebefore 2:29.0.1-22:29.0.1-2
PyPIkeystonefrom 14.0.0 · before 27.0.227.0.2
PyPIkeystonefrom 28.0.0 · before 28.0.228.0.2
PyPIkeystonefrom 29.0.0 · before 29.0.229.0.2

Same product

openstack: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-12691An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0.
    36Monitor
  • CVE-2020-12690An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0.
    36Monitor
  • CVE-2019-19687OpenStack Keystone 15.0.0 and 16.0.0 is affected by Data Leakage in the list credentials API.
    36Monitor
  • CVE-2026-43000An issue was discovered in OpenStack Keystone before 29.0.2.
    35Monitor
  • CVE-2026-42999An issue was discovered in OpenStack Keystone before 29.0.2.
    35Monitor
  • CVE-2020-12689An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0.
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
OpenStack Keystone27.0.2Vendor (CNA)
OpenStack Keystone28.0.2Vendor (CNA)
OpenStack Keystone29.0.2Vendor (CNA)
debian:keystone2:22.0.2-0+deb12u3 · Debian:12Package registry (OSV)
PyPI:keystone27.0.2Package registry (OSV)
PyPI:keystone28.0.2Package registry (OSV)
PyPI:keystone29.0.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-429990 days apartAn issue was discovered in OpenStack Keystone before 29.0.2.
    35Monitor
  • CVE-2026-430000 days apartAn issue was discovered in OpenStack Keystone before 29.0.2.
    35Monitor
  • CVE-2026-443940 days apartAn issue was discovered in OpenStack Keystone before 29.0.2.
    32Monitor
  • CVE-2026-4300127 days apartAn issue was discovered in OpenStack Keystone before 29.0.2.
    32Monitor
  • CVE-2026-8018289 days apartIn OpenStack Keystone before 29.0.3, tokens obtained via OAuth1 access token, application credential, or trust-scoped authentication could c
    30Monitor
  • CVE-2026-8018489 days apartIn OpenStack Keystone before 29.0.3, tokens obtained via delegated authentication mechanisms (OAuth1 access tokens, application credentials,
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records