Medium severity · published Jul 24, 2026
CVE-2026-66139
OpenStack Zaqar through 22.0.0 allows authentication bypass via an EXTRA-SPEC header when a UUID is known
4.8
CVSS
0.5%
EPSS
No
On KEV
Description
OpenStack Zaqar through 22.0.0 allows authentication bypass via an EXTRA-SPEC header when a UUID is known.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZA
Zaqar · OpenStack
12.0.0 before 20.1.1; 21.0.0; 22.0.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66139
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66139
bugs.launchpad.net
https://bugs.launchpad.net/ossa/+bug/2161254
www.openwall.com
https://www.openwall.com/lists/oss-security/2026/07/23/7
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/07/24/27
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6.1
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In OpenStack Zaqar before 23.0.1, the WebSocket transport fails to bind the project identifier in subsequent requests to the project authenticated by the Keystone token