Vulnerability · Published May 5, 2026 · Assigned by mitre
CVE-2026-43002
Medium 5.3
In plain English
A medium-severity security flaw in Horizon from OpenStack. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 70.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | horizon | 3:25.7.3-1 | DEBIAN-CVE-2026-43002 |
| PyPI | horizon | 25.7.3 | GHSA-vxvf-xvm3-p8j5 |
| PyPI | horizon | 25.7.3 | PYSEC-2026-2520 |
| Ubuntu:22.04:LTS | horizon | no fix listed | UBUNTU-CVE-2026-43002 |
| Ubuntu:24.04:LTS | horizon | no fix listed | UBUNTU-CVE-2026-43002 |
| Ubuntu:25.10 | horizon | no fix listed | UBUNTU-CVE-2026-43002 |
| Ubuntu:26.04:LTS | horizon | no fix listed | UBUNTU-CVE-2026-43002 |
| Ubuntu:26.10 | horizon | no fix listed | UBUNTU-CVE-2026-43002 |
Affected products (as reported)
Weakness: CWE-696 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L