Threat landscape
high

Synacor Zimbra Collaboration Suite: Mehrere Schwachstellen

WID-SEC-2026-4144 · first 26.10.2026 · updated 26.10.2026 · CVSS 8,7

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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 sich erweiterte Berechtigungen – einschließlich Root-Rechte – zu verschaffen, Sicherheitsmaßnahmen zu umgehen, Spoofing- und Cross-Site-Scripting-Angriffe durchzuführen, sensible Daten zu manipulieren oder offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

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

  • sich erweiterte Berechtigungen – einschließlich Root-Rechte – zu verschaffen
  • Sicherheitsmaßnahmen zu umgehen
  • Spoofing-
  • Cross-Site-Scripting-Angriffe durchzuführen
  • sensible Daten zu manipulieren oder offenzulegen oder einen Denial-of-Service-Zustand auszulösen

Am I affected?

Affected according to the BSI:

  • Synacor Zimbra ZCS 10.1.21
  • Synacor Zimbra ZCS 10.1.20
  • Synacor Zimbra ZCS 10.1.17
  • Synacor Zimbra ZCS 10.1.16

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Install the updates provided by the vendor; details in the sources below.

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

CVE: CVE-2026-10632, CVE-2026-50053, CVE-2026-115785, CVE-2026-115786, CVE-2026-93631, CVE-2026-93633, CVE-2026-93634, CVE-2026-93638, CVE-2026-93639, CVE-2026-50056, CVE-2026-50057, CVE-2026-93627, CVE-2026-93628, CVE-2026-93629, CVE-2026-93630, CVE-2026-93636, CVE-2026-93640

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.

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