CVE-2026-66139Network attack vector

Unauthenticated queue access via unvalidated EXTRA-SPEC header

Published Jul 24, 2026 · Updated Jul 24, 2026

Authentication bypass in OpenStack Zaqar 12.0.0 through 20.1.0, 21.0.0, and 22.0.0 allows remote attackers to access project queues. Zaqar treats an EXTRA-SPEC request header as alternate authentication even though its backend validation was never implemented, so requests carrying the header skip Keystone token checks. Knowledge of a project UUID is required; the bypass permits reading, enumerating, creating, and deleting that project's queues without a Keystone token.

CVSS severity4.8
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

Authentication bypass in OpenStack Zaqar 12.0.0 through 20.1.0, 21.0.0, and 22.0.0 allows remote attackers to access project queues. Zaqar treats an EXTRA-SPEC request header as alternate authentication even though its backend validation was never implemented, so requests carrying the header skip Keystone token checks. Knowledge of a project UUID is required; the bypass permits reading, enumerating, creating, and deleting that project's queues without a Keystone token.

The record

CVE
CVE-2026-66139
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
OpenStack
Product
Zaqar
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=12.0.0 <20.1.1
  2. Affected versionversion=21.0.0
  3. Affected versionversion=22.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenStack · Zaqarversion=12.0.0 <20.1.1; version=21.0.0; version=22.0.0

Published CVSS scores

4.8MITRECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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