CVE-2026-33373
Zimbra Collaboration CSRF Token Vulnerability
Description
An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A Cross-Site Request Forgery (CSRF) vulnerability exists in Zimbra Web Client due to the issuance of authentication tokens without CSRF protection during certain account state transitions. Specifically, tokens generated after operations such as enabling two-factor authentication or changing a password may lack CSRF enforcement. While such a token is active, authenticated SOAP requests that trigger token generation or state changes can be performed without CSRF validation. An attacker could exploit this by inducing a victim to submit crafted requests, potentially allowing sensitive account actions such as disabling two-factor authentication. The issue is mitigated by ensuring CSRF protection is consistently enforced for all issued authentication tokens.
INFO
Published Date :
March 30, 2026, 3:16 p.m.
Last Modified :
April 7, 2026, 6:50 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Ensure authentication tokens have CSRF protection.
- Validate tokens during account state transitions.
- Apply updates from the vendor.
- Review and enforce security policies.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33373.
| URL | Resource |
|---|---|
| https://wiki.zimbra.com/wiki/Security_Center | Vendor Advisory Release Notes |
| https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes | Release Notes |
| https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes | Release Notes |
| https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy | Product |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33373 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33373
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33373 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33373 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:* versions from (including) 10.0.0 up to (excluding) 10.0.18 *cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:* versions from (including) 10.1.0 up to (excluding) 10.1.13 Added Reference Type MITRE: https://wiki.zimbra.com/wiki/Security_Center Types: Release Notes, Vendor Advisory Added Reference Type MITRE: https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes Types: Release Notes Added Reference Type MITRE: https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes Types: Release Notes Added Reference Type MITRE: https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy Types: Product -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-352 -
New CVE Received by [email protected]
Mar. 30, 2026
Action Type Old Value New Value Added Description An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A Cross-Site Request Forgery (CSRF) vulnerability exists in Zimbra Web Client due to the issuance of authentication tokens without CSRF protection during certain account state transitions. Specifically, tokens generated after operations such as enabling two-factor authentication or changing a password may lack CSRF enforcement. While such a token is active, authenticated SOAP requests that trigger token generation or state changes can be performed without CSRF validation. An attacker could exploit this by inducing a victim to submit crafted requests, potentially allowing sensitive account actions such as disabling two-factor authentication. The issue is mitigated by ensuring CSRF protection is consistently enforced for all issued authentication tokens. Added Reference https://wiki.zimbra.com/wiki/Security_Center Added Reference https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes Added Reference https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes Added Reference https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy