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VulnerabilityPublished Updated

CVE-2026-43002: OpenStack Horizon · Incorrect Behavior Order

Affects OpenStack HorizonSource CVE Database V5

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Mentioned vulnerabilities

Not known to be exploited · CVSS 5.3 Medium : upgrade to 25.7.3 when convenient.

Data as of 1 Nov 2026, 11:02 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 29% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
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:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 1 Nov 2026.

What to do

Upgrade Horizon and openstack-horizon to 25.7.3.

Affected software

ProductAffectedFixed in
OpenStackHorizonAffected
  • >=25.6.0 <25.7.3
Fixed in
  • 25.7.3
PyPIopenstack-horizonpkg:pypi/openstack-horizonOther threatsAffected
  • =25.6.0
  • <25.7.3 >=25.7.0
Fixed in
  • 25.7.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, consider limiting exposure of the Horizon service to untrusted networks or implementing rate limiting to reduce the risk of storage exhaustion from unauthenticated requests.

Description

CVE-2026-43002 is a medium severity vulnerability in OpenStack Horizon versions 25.6.0 and 25.7 before 25.7.3. It involves a write operation to session storage before user authentication, which can lead to exhaustion of storage resources by unauthenticated requests. This issue is a regression of a previous fix (CVE-2014-8124).

References

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