CVE-2022-24682 — zm-build
MEDIUMCVE-2022-24682 is a medium-severity (CVSS 6.1) CWE-116 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2022-02-25) and has been used in ransomware campaigns — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2022-02-25 — including use in ransomware campaigns. Federal agencies were required to remediate by 2022-03-11.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2022-24682.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2022-24682 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.
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 Products
zimbra collaboration suitesynacorResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
An issue was discovered in the Calendar feature in Zimbra Collaboration …
An issue was discovered in the Calendar feature in Zimbra Collaboration …
An issue was discovered in the Calendar feature in Zimbra Collaboration …
An issue was discovered in the Calendar feature in Zimbra Collaboration …
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for CVE-2022-24682, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How to detect CVE-2022-24682
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2022-24682 -u https://target- Template
- Zimbra Collaboration Suite < 8.8.15 - Improper Encoding
- Severity
- medium
- Impact
- Attackers can inject malicious JavaScript through the Calendar feature that executes in victims' browsers, potentially stealing session tokens and accessing email communications of Zimbra users.
- Remediation
- Update Zimbra Collaboration Suite to version 8.8.15 patch 30 or later that properly escapes HTML in Calendar feature attributes.
Template by ProjectDiscovery nuclei-templates (rxerium), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2022-24682 in your dependencies?
Find it across , including transitive dependencies.