What is CVE-2023-34193?

CVE-2023-34193 is a high-severity vulnerability in Zimbra Collaboration, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2023-07-06.

How severe is CVE-2023-34193?

High severity. CVSS v3 base score is 8.8 out of 10.

Arbitrary file upload in Zimbra Collaboration

CVE-2023-34193

File Upload vulnerability in Zimbra ZCS 8.8.15 allows an authenticated privileged user to execute arbitrary code and obtain sensitive information via the ClientUploader function.

Vulnerability class: Unrestricted File Upload

Published 2023-07-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.1th percentile), scored 2026-09-27.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Zimbra Collaboration — versions 8.8.15

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

wiki.zimbra.com/wiki/Zimbra_Security_Advisories (Vendor Advisory)
wiki.zimbra.com/wiki/Security_Center (Release Notes, Vendor Advisory)
wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy (Not Applicable)

Frequently asked questions

What is CVE-2023-34193?: CVE-2023-34193 is a high-severity vulnerability in Zimbra Collaboration, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2023-07-06.
How severe is CVE-2023-34193?: High severity. CVSS v3 base score is 8.8 out of 10.