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CVE-2022-24682

MEDIUM
6.1
CVSS Score
Published: February 9, 2022 at 03:19 AM UTC
Updated: August 7, 2026 at 05:16 AM UTC
2 products affected across 1 vendorZimbra Collaboration SuiteCollaboration

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Severity
MEDIUM6.1
Exploitation
CISA KEV
Exploit prediction
EPSS 31%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score30.9%

EPSS (Exploit Prediction Scoring System) estimates a 30.9% chance this CVE is exploited in the wild within the next 30 days — higher than 98% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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
Apply updates per vendor instructions.
Ransomware Use
Known
Added to KEV
Feb 25, 2022
Remediation Due
Mar 11, 2022
1692 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2022-24682

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zimbra Collaboration Suite· Synacor
95%
8.8.0 ≤ v < 8.8.158.8.158.8.15 p18.8.15 p108.8.15 p118.8.15 p128.8.15 p138.8.15 p148.8.15 p158.8.15 p168.8.15 p178.8.15 p188.8.15 p198.8.15 p28.8.15 p208.8.15 p218.8.15 p228.8.15 p238.8.15 p248.8.15 p258.8.15 p268.8.15 p278.8.15 p288.8.15 p298.8.15 p38.8.15 p48.8.15 p58.8.15 p68.8.15 p78.8.15 p88.8.15 p9
Affected range stops below 8.8.15, so it looks safe — our inference, not a vendor statement
Collaboration· Synacor
75%
8.8.0 ≤ v < 8.8.158.8.158.8.15 p18.8.15 p108.8.15 p118.8.15 p128.8.15 p138.8.15 p148.8.15 p158.8.15 p168.8.15 p178.8.15 p188.8.15 p198.8.15 p28.8.15 p208.8.15 p218.8.15 p228.8.15 p238.8.15 p248.8.15 p258.8.15 p268.8.15 p278.8.15 p288.8.15 p298.8.15 p38.8.15 p48.8.15 p58.8.15 p68.8.15 p78.8.15 p88.8.15 p9
Affected range stops below 8.8.15, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://wiki.zimbra.com/wiki/Security_Center
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30
x_refsource_MISCVendor Advisory
Source: [email protected]
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-24682

SSVC — Action Prioritization

SSVCActiveNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-116

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