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    4 vulnerabilities found for Zimbra Collaboration Suite (ZCS) by Zimbra

    CVE-2026-93647 (GCVE-0-2026-93647)

    Vulnerability from cvelistv5 – Published: 2026-09-25 13:58 – Updated: 2026-09-28 12:39
    VLAI
    Title
    Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Crafted Calendar COUNTER Message From Address
    Summary
    An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.
    Severity
    9.3 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-26 03:55 UTC
    CWE
    • CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Zimbra Zimbra Collaboration Suite (ZCS) Affected: 0 , < 10.1.21 (semver)
    		Create a notification for this product.
    Date Public
    2026-09-25 13:53
    Credits
    Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7
    Show details on NVD website
    To clipboard 

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    CVE-2026-93643 (GCVE-0-2026-93643)

    Vulnerability from cvelistv5 – Published: 2026-09-25 13:57 – Updated: 2026-09-26 03:55
    VLAI
    Title
    Zimbra Collaboration Suite OnlyOffice Integration Path Traversal Leading to Remote Code Execution via Unauthenticated /downloadas Request
    Summary
    When OnlyOffice/Document Editing is available, an unauthenticated remote attacker with access to an existing supported public Briefcase document can abuse unsigned save fields to perform path-traversal writes and execute commands as zimbra.
    Severity
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-25 00:00 UTC
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-863 - Incorrect Authorization
    Assigner
    References
    Impacted products
    Vendor Product Version
    Zimbra Zimbra Collaboration Suite (ZCS) Affected: 0 , < 10.1.21 (semver)
    		Create a notification for this product.
    Date Public
    2026-09-25 13:53
    Credits
    Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7
    Show details on NVD website
    To clipboard 

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    CVE-2026-93642 (GCVE-0-2026-93642)

    Vulnerability from cvelistv5 – Published: 2026-09-25 13:56 – Updated: 2026-09-25 16:11
    VLAI
    Title
    Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share Invitation
    Summary
    An unauthenticated sender can forge a share notification that triggers stored XSS when a signed-in Zimbra Modern recipient clicks Accept Share, allowing the attacker to access mailbox data and act as the victim.
    Severity
    9.3 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-25 16:10 UTC
    CWE
    • CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Zimbra Zimbra Collaboration Suite (ZCS) Affected: 0 , < 10.1.21 (semver)
    		Create a notification for this product.
    Date Public
    2026-09-25 13:52
    Credits
    Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7
    Show details on NVD website
    To clipboard 

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    CVE-2026-93641 (GCVE-0-2026-93641)

    Vulnerability from cvelistv5 – Published: 2026-09-25 13:55 – Updated: 2026-09-25 16:11
    VLAI
    Title
    Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Forged Share Invitation
    Summary
    An unauthenticated sender can forge a share notification that triggers stored XSS when a signed-in Zimbra Classic recipient clicks Accept Share, allowing the attacker to access mailbox data and act as the victim.
    Severity
    9.3 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-25 16:11 UTC
    CWE
    • CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Zimbra Zimbra Collaboration Suite (ZCS) Affected: 0 , < 10.1.21 (semver)
    		Create a notification for this product.
    Date Public
    2026-09-25 13:52
    Credits
    Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7
    Show details on NVD website
    To clipboard 

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