---
cve: "CVE-2026-15556"
severity: "HIGH"
cvss: 8.1
epss: "22%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-08-11 09:17:12"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T01:57:25+02:00"
---

# CVE-2026-15556

> 8.1 HIGH

## Beschreibung

A flaw was found in Picketlink's SP signature validation; a SAML response containing zero assertion elements matching the signature check can allow an attacker to forge a SAML response and auth as any principal with any roles on the protected application.

## CVSS-Vektor

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

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

## Referenzen

- <https://access.redhat.com/errata/RHSA-2026:53644>
- <https://access.redhat.com/errata/RHSA-2026:53806>
- <https://access.redhat.com/security/cve/CVE-2026-15556>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2483121>
- <https://access.redhat.com/errata/RHSA-2026:53645>
- <https://access.redhat.com/errata/RHSA-2026:53646>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-15556) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_