# CVE-2026-10631 — Zimbra Collaboration Suite

> As of 2026-10-08, CVE-2026-10631 is a MEDIUM-severity vulnerability in Zimbra Collaboration Suite, CVSS v3.1 6.5, EPSS 0.2% (10.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-10631, most recently “Zimbra Collaboration Suite 10.1.20 Patches Critical Unauthenticated SNMP/Swatchdog Command Injection Plus Six Additional CVEs”.

**Last updated:** 2026-10-08

## What is CVE-2026-10631?

An authorization bypass in the EWS FindItem handler of Zimbra Collaboration Suite 10.1.0 through 10.1.19 allows an authenticated user with EWS enabled to read complete mailbox items, including raw MIME and attachments, from arbitrary local accounts without a share or delegation grant.

The record classifies CVE-2026-10631 under weakness class [CWE-639](https://intel.threadlinqs.com/cwe/CWE-639). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 4 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.5 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 10.6% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-08

## Is CVE-2026-10631 being exploited?

It currently carries a trending score of 37 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Zimbra](https://intel.threadlinqs.com/vendors/zimbra): Collaboration Suite

## How to fix CVE-2026-10631

No vendor patch reference has been recorded for CVE-2026-10631 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-10631

1 tracked threat in the Threadlinqs corpus references CVE-2026-10631, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Zimbra Collaboration Suite 10.1.20 Patches Critical Unauthenticated SNMP/Swatchdog Command Injection Plus Six Additional CVEs](https://intel.threadlinqs.com/threat/TL-2026-1586) — CRITICAL · 2026-07-21

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [wiki.zimbra.com — vendor advisory](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-10631
Full detection coverage and IOCs for threats exploiting CVE-2026-10631 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp