---
title: "CVE-2026-93631: Zimbra Collaboration Suite - Cross-Site Request Forgery"
description: "Zimbra Collaboration Suite (ZCS) Network Edition 10.1.16 and 10.1.20 contains a cross-site request forgery caused by OAuth callback not binding state or authorization code to session, letting attackers link external accounts to victim mailboxes, exploit requires victim to be signed in and load malicious callback."
url: https://panop.io/threat-heartbeat/CVE-2026-93631/
---

# CVE-2026-93631 Zimbra Collaboration Suite - Cross-Site Request Forgery

Zimbra Collaboration Suite (ZCS) Network Edition 10.1.16 and 10.1.20 contains a cross-site request forgery caused by OAuth callback not binding state or authorization code to session, letting attackers link external accounts to victim mailboxes, exploit requires victim to be signed in and load malicious callback.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93631)

## Details

Type

Cross-Site Request Forgery

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-352](https://cwe.mitre.org/data/definitions/352.html)

## Vendor fix

Update to a version later than 10.1.20 or apply vendor patches.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-93631](https://nvd.nist.gov/vuln/detail/CVE-2026-93631)
- [https://wiki.zimbra.com/wiki/Zimbra\_Security\_Advisories](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)
- [https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/](https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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