CVE-2022-24682
MediumExploitedPublic exploitAn 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.
Published Feb 9, 2022 · Updated Oct 8, 2026
Key Facts
Patch immediately- CVE-2022-24682 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Zimbra Collaboration Suite (Synacor).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 16, 2021 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 31% probability of exploitation in the next 30 days.
- Fixed versions are available, including Zimbra Collaboration Suite 8.8.15.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
31%
Higher than 98.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2022-24682 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 25, 2022 | Mar 11, 2022 | Known |
| Industry KEV feed | Dec 16, 2021 | Mar 11, 2022 | Known |
| CIRCL KEV | Feb 25, 2022 | Mar 11, 2022 | Known |
| ENISA EUVD | Feb 25, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
31 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Zimbra Collaboration SuiteSynacor | 8.8.15, 8.8.15-p1, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13, 8.8.15-p14, 8.8.15-p15 | 8.8.15 |
Patched Releases
Zimbra Collaboration Suite
8.8.15
Timeline
Added to Industry KEV feed
Dec 16, 2021
Publicly disclosed
Feb 9, 2022
Added to CISA KEV
Feb 25, 2022
Added to CIRCL KEV
Feb 25, 2022
Added to ENISA EUVD
Feb 25, 2022
Last updated
Oct 8, 2026
Weakness Type
- CWE-116 Improper Encoding or Escaping of Output
References
- advisoryVulnCheck exploitation report
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2022/24xxx/CVE-2022-24682.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2022-24682
- advisoryhttps://wiki.zimbra.com/wiki/Security_Center
- advisoryhttps://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30
FAQ
Common Questions.
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.
Affected: Zimbra Collaboration Suite (Synacor) versions 8.8.15, 8.8.15-p1, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13, 8.8.15-p14, 8.8.15-p15. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 16, 2021 and is known to be used in ransomware campaigns.
Yes. It was added on Feb 25, 2022 with a federal remediation due date of Mar 11, 2022.
Public exploit code is available.
Fixed versions are available, including Zimbra Collaboration Suite 8.8.15.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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