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Zimbra Collaboration SuiteApplication · Synacor

CVE-2024-45514

MEDIUM · 5.4 CVSS v3.1 Published 2024-11-21
Fix available
A fix is available. Upgrade to 8.8.15 / 10.0.9 or later.
See remediation →
58/100
Remediation priority · Elevated
Remotely reachable

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An issue was discovered in Zimbra Collaboration (ZCS) through v10.1. A Cross-Site Scripting (XSS) vulnerability exists in one of the endpoints of Zimbra Webmail due to insufficient sanitization of the packages parameter. Attackers can bypass the existing checks by using encoded characters, allowing the injection and execution of arbitrary JavaScript within a victim's session.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A reflected Cross-Site Scripting (XSS) vulnerability exists in Zimbra Collaboration (ZCS) Webmail due to insufficient sanitization of the packages parameter in one of the endpoints. Attackers can bypass existing input validation checks by using encoded characters to inject and execute arbitrary JavaScript within a victim's authenticated session.

MitigationImplement proper input validation and output encoding for the packages parameter, including decoding and sanitizing encoded characters before processing. Apply context-appropriate output encoding when reflecting user input back to the browser.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Zimbra Collaboration SuiteApplication
Affected:< 8.8.15>= 10.0.0, < 10.0.9= 8.8.15= 9.0.0= 10.1.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Zimbra Collaboration Suite version
    Run 'zmcontrol -v' or check /opt/zimbra/.git describe or the admin console for the ZCS version number
    Affected if The installed version falls within < 8.8.15, 8.8.15, 9.0.0, 10.0.0-10.0.8, or 10.1.0
  2. Confirm ZCS Webmail is deployed and accessible
    Verify the Zimbra webmail interface (typically port 443 or 8080) is accessible by checking if the service is running with 'zmmailboxdctl status' or inspecting netstat for listening HTTP/HTTPS ports
    Affected if The ZCS Webmail service is running and externally or internally accessible
  3. Verify authentication is enabled for Webmail
    Check the ZCS configuration for zmAuthEnabled or the Mailboxd servlet configuration to confirm user authentication is required for webmail access
    Affected if Webmail allows authenticated user sessions, which is required for the reflected XSS to execute in a victim's context
  4. Inspect the packages parameter endpoint
    Review webmail proxy and servlet configurations in /opt/zimbra/conf or the Jetty configuration to identify the endpoint handling the 'packages' parameter
    Affected if The vulnerable endpoint accepting the 'packages' parameter is exposed and accessible to authenticated users

You are affected if your ZCS version is 8.8.15, 9.0.0, 10.0.0-10.0.8, or 10.1.0 AND the Zimbra Webmail interface with user authentication is enabled and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 8.8.15 / 10.0.9 or later
Fixed in 8.8.1510.0.9
Interim mitigation

Implement proper input validation and output encoding for the packages parameter, including decoding and sanitizing encoded characters before processing. Apply context-appropriate output encoding when reflecting user input back to the browser.

Recommended fix High confidence

Zimbra 10.0.9 or later (10.1.x recommended); Zimbra 8.8.15 Patch 13+ for legacy installations

  1. 1. Identify the current Zimbra Collaboration Suite version by running: zmcontrol -v or checking the admin console
  2. 2. For Zimbra 10.x versions (10.0.0 through 10.0.8): Upgrade to version 10.0.9 or later (recommended: latest 10.x stable release)
  3. 3. For Zimbra 9.0.0: Upgrade to version 10.0.9 or later (recommended: latest stable release)
  4. 4. For Zimbra 8.8.15 and earlier: Upgrade to version 8.8.15 Patch 13 or later, or migrate to a supported 10.x version
  5. 5. After upgrade, verify the packages parameter endpoint no longer accepts encoded character XSS payloads
  6. 6. Test that legitimate webmail functionality remains intact after patching
Caveat Upgrading across major version jumps (e.g., 8.x to 10.x) may require migration planning and compatibility testing of custom integrations

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Zimbra Collaboration Suite Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-45514 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data