CVE-2026-43002

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-05 · updated 2026-09-10
Weakness: CWE-696

Description

An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3. There is a write operation to the session storage backend before authentication and thus storage can be exhausted by unauthenticated requests. This is a regression of the CVE-2014-8124 fix.

Affected products

OpenStack Horizon: from 25.6.0 before 25.7.3 — fixed in 25.7.3

How to fix

Upgrade to a fixed version: OpenStack Horizon 25.7.3. Check the vendor advisory for mitigations.

References

https://bugs.launchpad.net/horizon/+bug/2150331
https://security.openstack.org/ossa/OSSA-2026-009.html
https://www.openwall.com/lists/oss-security/2026/05/05/7
https://bugs.launchpad.net/horizon/+bug/2150331

Get alerted when CVE-2026-43002 or the next vulnerability affects your stack