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CVE-2022-24682

Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting

6.1 MEDIUMActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 30.9%
  1. Published9 Feb 2022
  2. Added to CISA KEV25 Feb 2022
  3. Remediation due11 Mar 2022
Actively exploited (CISA KEV)

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability in the Calendar feature that allows an attacker to execute arbitrary code.

Added to KEV: 25 Feb 2022Federal remediation due: 11 Mar 2022Used in ransomware

Description

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

Synacor Zimbra Collaboration Suite≥ 8.8.0 < 8.8.15 · 8.8.15

Remediation

Fixed in
Synacor Zimbra Collaboration Suite≥ 8.8.15

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Frequently asked

Is CVE-2022-24682 being actively exploited?

Yes. CVE-2022-24682 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Feb 2022. It has been used in ransomware campaigns.

How severe is CVE-2022-24682?

CVE-2022-24682 has a CVSS 3.1 base score of 6.1, rated medium. EPSS estimates a 30.9% probability of exploitation.

Which products are affected by CVE-2022-24682?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2022-24682?

Upgrade affected software to a fixed version, for example Synacor Zimbra Collaboration Suite 8.8.15 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-24682 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.