CVE-2023-34192
CriticalExploitedPublic exploitCross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.
Published Jul 7, 2023 · Updated Aug 12, 2026
Key Facts
Patch immediately- CVE-2023-34192 is a critical-severity vulnerability (CVSS 9.0 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 Feb 25, 2025. Public exploit code is available.
- EPSS estimates a 77% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
77%
Higher than 99.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 25, 2025 | Mar 18, 2025 | Not reported |
| Industry KEV feed | Feb 25, 2025 | Mar 18, 2025 | Not reported |
| CIRCL KEV | Feb 25, 2025 | Mar 18, 2025 | Not reported |
| ENISA EUVD | Feb 25, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
41 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 | n/a |
Timeline
Publicly disclosed
Jul 7, 2023
Added to CISA KEV
Feb 25, 2025
Added to Industry KEV feed
Feb 25, 2025
Added to CIRCL KEV
Feb 25, 2025
Added to ENISA EUVD
Feb 25, 2025
Last updated
Aug 12, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2023/34xxx/CVE-2023-34192.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2023-34192
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-29381
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-29382
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-34192
FAQ
Common Questions.
Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.
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 Feb 25, 2025.
Yes. It was added on Feb 25, 2025 with a federal remediation due date of Mar 18, 2025.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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