How severe is CVE-2026-43002?

CVE-2026-43002 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-43002 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-43002?

CVE-2026-43002 affects Openstack Horizon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-43002?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-43002 have an EU (EUVD) identifier?

Yes. CVE-2026-43002 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27406.

When was CVE-2026-43002 published?

CVE-2026-43002 was published on 2026-05-05 and last updated on 2026-09-10.

CVE-2026-43002

CVE-2026-43002 is a medium-severity vulnerability in Openstack Horizon with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-696.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27406
Weakness: CWE-696
Affected product: Openstack Horizon
Published: 2026-05-05
Last modified: 2026-09-10

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-43002?: CVE-2026-43002 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-43002 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-43002?: CVE-2026-43002 affects Openstack Horizon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-43002?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-43002 have an EU (EUVD) identifier?: Yes. CVE-2026-43002 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27406.
When was CVE-2026-43002 published?: CVE-2026-43002 was published on 2026-05-05 and last updated on 2026-09-10.

References

Affected products (1)

cpe:2.3:a:openstack:horizon:*:*:*:*:*:*:*:*

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