Actively exploited in the wild
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
Synacor - Zimbra Collaboration Suite (ZCS) · Listed in the CISA KEV since 2026-03-18. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVE-2025-66376
HighCVSS 7.2KEVSummary
Zimbra Collaboration (ZCS) w wersjach 10 przed 10.0.18 oraz 10.1 przed 10.1.13 umożliwia przeprowadzenie ataku typu stored XSS w Classic UI poprzez dyrektywy @import w arkuszach stylów CSS w wiadomościach e-mail HTML.
Risk Assessment
Atakujący może wykorzystać tę podatność do wstrzyknięcia złośliwego kodu, co może prowadzić do kradzieży danych użytkowników lub przejęcia ich kont. Organizacje powinny być świadome potencjalnych zagrożeń związanych z bezpieczeństwem danych.
Recommendation
Zaleca się aktualizację Zimbra Collaboration do najnowszej wersji, aby usunąć tę podatność. Dodatkowo warto monitorować i filtrować wiadomości e-mail w celu wykrywania potencjalnie złośliwych treści.
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Original NVD description (English source)
Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.