---
cve: "CVE-2026-45076"
severity: "MEDIUM"
cvss: 5.1
epss: "37%"
vendor: "element-hq"
kev: false
exploited: false
published: "2026-05-28 17:16:31"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T05:03:38+02:00"
---

# CVE-2026-45076

> 5.1 MEDIUM · 🧪 PoC

## Beschreibung

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- d97b5b9e21681792d78c5d58243fc483c664b66e (Commit)

## Referenzen

- <https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45076) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_