---
cve: "CVE-2026-25742"
severity: "MEDIUM"
cvss: 5.3
epss: "31%"
vendor: "zulip"
kev: false
exploited: false
published: "2026-04-03 21:17:10"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T05:42:48+02:00"
---

# CVE-2026-25742

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

Zulip is an open-source team collaboration tool. Prior to version 11.6, Zulip is an open-source team collaboration tool. From version 1.4.0 to before version 11.6, even after spectator access (enable_spectator_access / WEB_PUBLIC_STREAMS_ENABLED) is disabled, attachments originating from web-public streams can still be retrieved anonymously. As a result, file contents remain accessible even after public access is intended to be disabled. Similarly, even after spectator access is disabled, the /users/me//topics endpoint remains reachable anonymously, allowing retrieval of topic history for web-public streams. This issue has been patched in version 11.6. This issue has been patched in version 11.6.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 4c2ab731279918d570602c79965cb8c6e2c3c4fc (Commit)
- 3c045414299680b9f5dca7d76cf6cef6121c0236 (Commit)

## Referenzen

- <https://github.com/zulip/zulip/security/advisories/GHSA-f47p-xjqq-g28w>
- <https://github.com/zulip/zulip/commit/3c045414299680b9f5dca7d76cf6cef6121c0236>
- <https://github.com/zulip/zulip/commit/41e23347b5218b3b0397a55176c7d97396735bae>
- <https://github.com/zulip/zulip/releases/tag/11.6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-25742) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_