CVE-2022-24682: Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

CISA Known Exploited Vulnerabilities

Name

Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

Vendor

Synacor

Product

Zimbra Collaborate Suite (ZCS)

Added to the catalog

2022-02-25

Due date for US federal agencies

2022-03-11

Weaknesses

CWE-79, CWE-116

Catalog version

2026.10.30

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

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA marks this vulnerability as known to be used in ransomware campaigns. CISA does not say which group used it.

Links in CISA's notes

• https://nvd.nist.gov/vuln/detail/CVE-2022-24682

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2022-02-09T04:15:07.400

Last modified

2026-08-07T05:16:55.740

Weaknesses

CWE-116

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.

References

• https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/ (Vendor Advisory)
• https://wiki.zimbra.com/wiki/Security_Center (Vendor Advisory)
• https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30 (Release Notes, Vendor Advisory)
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories (Vendor Advisory)
• https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/ (Exploit, Third Party Advisory)
• https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/ (Vendor Advisory)
• https://wiki.zimbra.com/wiki/Security_Center (Vendor Advisory)
• https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30 (Release Notes, Vendor Advisory)
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories (Vendor Advisory)
• https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/ (Exploit, Third Party Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-24682 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:59.479Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2022-24682

CVE record

Assigner

mitre

State

PUBLISHED

Published

2022-02-09T03:19:04.000Z

Updated

2026-08-07T03:55:20.799Z

Problem types

n/a

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.

References

• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• https://wiki.zimbra.com/wiki/Security_Center
• https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/
• https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/
• https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30

Read on 2026-11-03T01:10:15.754Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2022/24xxx/CVE-2022-24682.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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