CVE-2022-24682Known exploitationPublic exploitNetwork attack vector

Mailbox theft via unescaped Calendar attribute markup

Published Feb 9, 2022 · Updated Aug 7, 2026

Stored XSS in the Calendar feature of Zimbra Collaboration Suite 8.8.x allows remote attackers to execute JavaScript in user sessions. The Classic HTML client renders attacker-controlled HTML placed inside element attributes without escaping it, injecting executable markup into the document. A logged-in user must follow a crafted link; observed exploitation stole mailbox messages and attachments through the user's session.

CVSS severity6.1
Medium
EPSS probability30.93%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the Calendar feature of Zimbra Collaboration Suite 8.8.x allows remote attackers to execute JavaScript in user sessions. The Classic HTML client renders attacker-controlled HTML placed inside element attributes without escaping it, injecting executable markup into the document. A logged-in user must follow a crafted link; observed exploitation stole mailbox messages and attachments through the user's session.

The record

CVE
CVE-2022-24682
Published
Feb 9, 2022
Updated
Aug 7, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-116, T1059.007, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2021Exploitation reportedOperation EmailThief exploitation by TEMP_Heretic
  2. Feb 9, 2022CVE publishedPublication date reported by the CVE source.
  3. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1CISACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1059.007Command and Scripting Interpreter: JavaScript/JScript
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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