Vulnerability in OpenStack Horizon
CVE-2026-43002
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (47.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- OpenStack Horizon — versions 25.6.0
Weakness classification (CWE)
References
- bugs.launchpad.net/horizon/+bug/2150331 (Exploit, Issue Tracking, Vendor Advisory)
- www.openwall.com/lists/oss-security/2026/05/05/7 (Patch, Mailing List, Third Party Advisory)
- security.openstack.org/ossa/OSSA-2026-009.html (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-43002?
- CVE-2026-43002 is a medium-severity vulnerability in OpenStack Horizon, classified under CWE-696. CVSS score: 5.3/10. Published 2026-05-05.
- How severe is CVE-2026-43002?
- Medium severity. CVSS v3 base score is 5.3 out of 10.