CVE-2026-42999Public exploitNetwork attack vector

Cloud-admin escalation via policy target injection

Published May 28, 2026 · Updated May 28, 2026

Authorization bypass in affected OpenStack Keystone releases allows remote authenticated users to escalate to cloud admin. The enforce_call policy enforcer merges raw JSON body keys into a dictionary already populated from database lookups, letting untrusted keys overwrite trusted targets. Any authenticated account can reach policy-protected endpoints and read credential secrets, create credentials for other users, or gain cloud-admin authority.

CVSS severity6.0
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in affected OpenStack Keystone releases allows remote authenticated users to escalate to cloud admin. The enforce_call policy enforcer merges raw JSON body keys into a dictionary already populated from database lookups, letting untrusted keys overwrite trusted targets. Any authenticated account can reach policy-protected endpoints and read credential secrets, create credentials for other users, or gain cloud-admin authority.

The record

CVE
CVE-2026-42999
Published
May 28, 2026
Updated
May 28, 2026
Vendor
OpenStack
Product
Keystone
Classifications
CWE-863, CWE-639, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=14.0.0 <27.0.2
  2. Affected versionversion=28.0.0 <28.0.2
  3. Affected versionversion=29.0.0 <29.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenStack · Keystoneversion=14.0.0 <27.0.2; version=28.0.0 <28.0.2; version=29.0.0 <29.0.2

Published CVSS scores

6.0MITRECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.3Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-639Authorization Bypass Through User-Controlled Key
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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