5.3

CVE-2026-43002: openstack horizon Incorrect Behavior Order

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-vxvf-xvm3-p8j5PYSEC-2026-2520UBUNTU-CVE-2026-43002
Published 05-05-2026Last modified 06-05-2026
Open JSON

Vulnerability summary

CVE-2026-43002 is a medium (CVSS 5.3) Incorrect Behavior Order vulnerability in openstack horizon. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 47.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.60%
0%100%
Low · +0.24 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 05-05-2026
    PublishedVulnerability first disclosed.
  2. 06-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.60%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

+0.24 pp

From 0.36% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.60%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugs.launchpad.net)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • horizon< 3:25.7.3-1
Openstack1 product
PyPI1 product
  • horizon≥ 25.6, < 25.7.3
Ubuntu1 product
  • horizonAll versions (No fix recorded)

4 vendors · 4 products

References

10 links