Security readout for executives and security teams
Plain-English summary
CVE-2022-24682 is a Zimbra Collaboration Suite calendar vulnerability that can let malicious JavaScript run in a user's browser. It was exploited in the wild starting in December 2021. The main business risk is compromise of email sessions or mailbox data after a user interacts with malicious calendar content.
Executive priority
Treat as urgent for any organization still running affected Zimbra versions. Although the CVSS score is medium, confirmed exploitation and potential email theft raise operational priority. Patch verification and compromise review should be tracked to closure.
Technical view
The flaw affects the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 Patch 30 update 1. Improper output neutralization allows executable JavaScript inside HTML element attributes to become unescaped, injecting arbitrary markup into the document. CVSS is 6.1, with network access, low complexity, no privileges, and user interaction required.
Likely exposure
Organizations running Zimbra Collaboration Suite 8.8.x below 8.8.15 Patch 30 update 1 are the stated exposure group. Internet-facing Zimbra webmail deployments are higher concern because attackers can target users remotely through calendar-related content.
Exploitation context
Active exploitation is supported by both CISA KEV and Volexity reporting. Volexity described Operation EmailThief using the zero-day against Zimbra to steal email data. The vulnerability requires user interaction, but real-world campaigns show that this requirement did not prevent exploitation.
Researcher notes
The public record identifies CWE-116 and a stored/reflected markup injection path in Calendar rendering. Sources do not provide complete affected CPE data. Avoid assuming exposure outside Zimbra Collaboration Suite 8.8.x before 8.8.15 Patch 30 update 1 unless vendor guidance confirms it.
Mitigation direction
- Upgrade affected Zimbra 8.8.x deployments to 8.8.15 Patch 30 update 1 or later vendor guidance.
- Review Zimbra’s security advisories and release notes for any additional required hotfix instructions.
- If immediate patching is delayed, follow Zimbra Security Center guidance for temporary risk reduction.
- Prioritize internet-facing Zimbra systems and high-value mailboxes for remediation.
Validation and detection
- Inventory all Zimbra Collaboration Suite instances and record exact version and patch level.
- Confirm whether any instance is below 8.8.15 Patch 30 update 1.
- Review CISA KEV entry for required remediation timelines if applicable.
- Review Volexity and Zimbra advisories for indicators and post-exploitation review guidance.
- Check mail and web application logs for suspicious calendar or webmail activity during relevant periods.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-116: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-24682 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesCVE reference, mitre · x_refsource_MISC
- https://wiki.zimbra.com/wiki/Security_CenterCVE reference, mitre · x_refsource_MISC
- https://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/CVE reference, mitre · x_refsource_MISC
- https://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/CVE reference, mitre · x_refsource_MISC
- https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30CVE reference, mitre · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-24682CVE reference, CISA-ADP · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Encoding or Escaping of Output
Improper Encoding or Escaping of Output represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.