CVE-2023-34192
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.
do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Can a WAF block it? Yes. The attack involves sending a crafted script in an HTTP request to the /h/autoSaveDraft endpoint, which is part of the web interface. A WAF could detect suspicious script content in this specific endpoint, but some legitimate requests might also contain similar data, making filtering only partly reliable. A custom WAF rule can filter script code in the /h/autoSaveDraft request, but attackers can vary the request. No tracked WAF vendor has published a rule for this CVE yet.
What a custom rule would match: script code in the /h/autoSaveDraft request
Also consider: patch · custom WAF rule · CSP · output encoding
Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2023-34192 being exploited?
Yes. CVE-2023-34192 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2023-34192?
CVE-2023-34192 is rated Critical with a CVSS score of 9.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2023-34192?
Yes. A fix has been recorded for CVE-2023-34192. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2023-34192 affect?
CVE-2023-34192 affects synacor:zimbra_collaboration_suite. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
public exploits
Detection templates only, no public exploit found: 1 Nuclei template
- Zimbra Collaboration Suite (ZCS) v.8.8.15 - Cross-Site Scripting · detection template · critical
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- no
- technical impact
- total
Assessed by CISA 25 Feb 2025 (SSVC 2.0.3).
timeline
- 6 Jul 2023Published
- 25 Feb 2025Added to CISA KEV (exploited in the wild) · 599 days (about 2 years) later
- 25 Feb 2025CISA SSVC assessment: exploitation active · 1 day later
- 18 Mar 2025CISA remediation due date (US federal agencies) · 20 days later
- 21 Oct 2025CVE record last updated · 218 days (about 7 months) later
- 2 Nov 2026Analysed by vulneraibility.com · 377 days (about 1 year) later
- Linkwiki.zimbra.com /wiki/Zimbra_Security_Advisories
- Linkwiki.zimbra.com /wiki/Security_Center
- Linkwiki.zimbra.com /wiki/Zimbra_Responsible_Disclosure_Policy
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-34192
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Nuclei templates: detection templates
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.