CVE-2026-93647

Published Sep 25, 2026

Last updated a day ago

CVSS critical 9.3
Rails

Overview

Description
An unauthenticated calendar sender can place active markup in a COUNTER message's RFC From address. Selecting the message in Zimbra Classic triggers stored XSS, allowing the attacker to access mailbox data and act as the victim.
Source
cve@rapid7.com
NVD status
Awaiting Analysis

Risk scores

CVSS 3.1

Type
Secondary
Base score
9.3
Impact score
5.8
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Severity
CRITICAL

Weaknesses

cve@rapid7.com
CWE-79

Social media

Hype score
Not currently trending

  1. Warning: Critical Stored XSS in #Zimbra Collaboration Suite. CVE-2026-93641 CVE-2026-93642 CVE-2026-93647 CVSS: 9.3. These flaws can lead to mailbox data access and actions as the victim! #Patch #Patch #Patch

    @CCBalert

    28 Sept 2026

    324 Impressions

    1 Retweet

    1 Like

    0 Bookmarks

    0 Replies

    0 Quotes

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References

Sources include official advisories and independent security research.