CVE WatchOct 23, 2026

CVE-2026-10632

A reflected cross-site scripting vulnerability in the Classic Web Client of Zimbra Collaboration Suite (ZCS) allows an attacker to inject Ja

CVSS

8.7

High

EPSS

0.3%

p23

KEV

—

Exploit Today

0-100

Published: Oct 23, 2026 · Last modified: Oct 23, 2026 · CWE-79

EPSS · 30d

Not enough EPSS history yet.

Technical description

A reflected cross-site scripting vulnerability in the Classic Web Client of Zimbra Collaboration Suite (ZCS) allows an attacker to inject JavaScript through the packages parameter of the /h/rest document editor. The editor inserts package names into script attributes without HTML encoding. When combined with CVE-2026-50053, an attacker with an ordinary Zimbra account can supply their own authentication token and document identifiers in a URL and execute JavaScript in another signed-in user's Zimbra browser session when that user opens the URL. This permits reading mailbox data and performing authenticated actions as the victim. The issue affects ZCS 10.1.16 and was remediated in 10.1.17.

Official references

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