---
cve: "CVE-2026-90452"
severity: "MEDIUM"
cvss: 6.0
epss: "0.1%"
vendor: "CISA"
kev: false
exploited: false
published: "2026-09-11 22:16:47"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-10T17:37:50+02:00"
---

# CVE-2026-90452

> 6.0 MEDIUM

## Beschreibung

Requests from the reverse proxy to the identity-provider service for token discovery, introspection, and credential exchange do not verify the identity provider's server certificate. An attacker positioned on the network path between the proxy and the identity provider could impersonate the identity provider and issue forged authentication tokens accepted by the deployment.

## CNA-Record (Kanon, cvelistV5)

- CNA: **icscert**
- State: PUBLISHED
- Stand: 2026-10-02 20:59:14
- CNA-CVSS: **6.0** (`CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Benachbart | warn |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-295** — Improper Certificate Validation
  The product does not validate, or incorrectly validates, a certificate.

## Angriffsmuster (CAPEC)

- [CAPEC-459 — Creating a Rogue Certification Authority Certificate](https://capec.mitre.org/data/definitions/459.html) _(Severity: Very High)_
- [CAPEC-475 — Signature Spoofing by Improper Validation](https://capec.mitre.org/data/definitions/475.html) _(Severity: High)_

## Patch verfügbar (OSV)

- ca3d1febde94fef45d82151772a40f5f961a35c9 (Commit)

## Referenzen

- <https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.json>
- <https://www.cisa.gov/news-events/ics-advisories/icsa-26-254-01>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-90452/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_