CVE-2026-43002: OpenStack Horizon has Incorrect Behavior Order
Affects horizonSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 5.3 Medium : upgrade to 25.7.3 when convenient.
Data as of 27 Oct 2026, 00:07 UTC
- Patch
- Available – fixed in 25.7.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LExploitation evidence
Disclosed: evidence found.
CVE published 5 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade horizon to 25.7.3.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| PyPIhorizon | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- nvd.nist.gov/vuln/detail/CVE-2026-43002 (opens in a new tab)
- bugs.launchpad.net/horizon/+bug/2150331 (opens in a new tab)
- github.com/openstack/horizon (opens in a new tab)
- security.openstack.org/ossa/OSSA-2026-009.html (opens in a new tab)
- openwall.com/lists/oss-security/2026/05/05/7 (opens in a new tab)