---
cve: "CVE-2026-57817"
severity: "HIGH"
cvss: 8.1
epss: "44%"
vendor: "Apache Software Foundation"
kev: false
exploited: false
published: "2026-08-06 11:16:30"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T04:26:36+02:00"
---

# CVE-2026-57817

> 8.1 HIGH

## Beschreibung

The OpenID Connect Core 1.0 specification mandates that the RP MUST validate the `c_hash` parameter when operating in the Hybrid Flow. If an Apache CXF RP is integrated with a non-compliant or misconfigured Identity Provider (IdP) that omits the `c_hash`, the RP becomes vulnerable to Authorization Code Substitution/Injection attacks. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 16d606b3c4d5c7d271fd3b488c60a208586acb3f (Commit)
- 8797a177ec23e9c578c78a630c154ad27d9bbe8d (Commit)

## Referenzen

- <https://lists.apache.org/thread/pj63c3pf7kkp1xhr53do704fwj3t3htn>
- <http://www.openwall.com/lists/oss-security/2026/08/06/19>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-57817) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_