Synacor Zimbra: Mehrere Schwachstellen
WID-SEC-2026-1735 · first 29.05.2026 · updated 26.10.2026 · CVSS 8,2
What it is about
Zimbra ist eine Groupware-Lösung, die E-Mail, Kalender und Aufgabenverwaltung bietet. Ein Angreifer kann mehrere Schwachstellen in Synacor Zimbra ausnutzen, um Informationen offenzulegen, um einen Cross-Site Scripting Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- Informationen offenzulegen
- einen Cross-Site Scripting Angriff durchzuführen
- Sicherheitsvorkehrungen zu umgehen
Am I affected?
Affected according to the BSI:
- Synacor Zimbra <10.1.17
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Synacor Zimbra 10.1.17
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Zimbra Security Advisories vom 2026-05-28 wiki.zimbra.com
- PoC CVE-2026-73571 www.rapid7.com
CVE: CVE-2026-73571, CVE-2026-73572, CVE-2026-73573, CVE-2026-73574, CVE-2026-73575, CVE-2026-73576
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.