CVE-2026-43002 json
OpenStack Horizon has Incorrect Behavior Order
published 2026-05-05 6 mo ago modified 2026-09-10 59 d ago also GHSA-vxvf-xvm3-p8j5 , PYSEC-2026-2520 , EUVD-2026-27406
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi horizon 25.7.3
- OpenStack Horizon 25.7.3
- horizon Debian 14 3:25.7.3-1
debian advisories DEBIAN-CVE-2026-43002
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- bugs.launchpad.net https://bugs.launchpad.net/horizon/+bug/2150331 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | horizon | >=25.6, <25.7.3 |
25.7.3 |
Affected products
- OpenStack Horizon
Classification
- Weakness
-
- CWE-696 Incorrect Behavior Order
References
-
openwall.com
/lists/oss-security/2026/05/05/7
web, mailing-list, patch, third-party-advisory
-
security.openstack.org
/ossa/OSSA-2026-009.html
web, patch, vendor-advisory
-
bugs.launchpad.net
/horizon/+bug/2150331
exploit, web, issue-tracking, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-43002
advisory
-
github.com
/openstack/horizon
package
-
pypi.org
/project/horizon
package
-
github.com
/advisories/GHSA-vxvf-xvm3-p8j5
advisory
Sources
- CVE List CVE-2026-43002
- GitHub Advisory GHSA-vxvf-xvm3-p8j5
- NVD CVE-2026-43002
- OSV PYSEC-2026-2520
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.