What is CVE-2023-29381?

CVE-2023-29381 is a critical-severity vulnerability in Zimbra Collaboration, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2023-07-06.

How severe is CVE-2023-29381?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Zimbra Collaboration

CVE-2023-29381

An issue in Zimbra Collaboration (ZCS) v.8.8.15 and v.9.0 allows a remote attacker to escalate privileges and obtain sensitive information via the password and 2FA parameters.

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.1th percentile), scored 2026-09-27.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Zimbra Collaboration — versions 8.8.15, 9.0.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

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-2023-29381?: CVE-2023-29381 is a critical-severity vulnerability in Zimbra Collaboration, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2023-07-06.
How severe is CVE-2023-29381?: Critical severity. CVSS v3 base score is 9.8 out of 10.