Is CVE-2026-33368 in the CISA KEV catalog?

No. CVE-2026-33368 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-33368?

CVE-2026-33368 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2026-33368?

CVE-2026-33368 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33368?

Upgrade zimbra collaboration suite to 10.1.16 or later.

CVE & CISA-KEV Catalog

CVE-2026-33368

MEDIUM

6.1

CVSS v3

NVD

Description

Zimbra Collaboration Suite (ZCS) 10.0 and 10.1 contains a reflected cross-site scripting (XSS) vulnerability in the Classic Webmail REST interface (/h/rest). The application fails to properly sanitize user-supplied input, allowing an unauthenticated attacker to inject malicious JavaScript into a crafted URL. When a victim user accesses the link, the injected script executes in the context of the Zimbra webmail application, which could allow the attacker to perform actions on behalf of the victim.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

zimbra collaboration suiteNVD

Affected:>= 10.0.0, < 10.1.16Fixed in:10.1.16CVE-2026-33368derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Vendor Advisory2

Release Notes1

wiki.zimbra.com

Product1

wiki.zimbra.com

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

Embed a live status badge for CVE-2026-33368

Markdown

[![CVE-2026-33368](https://tridentstack.com/cve/badge/CVE-2026-33368.svg)](https://tridentstack.com/cve/CVE-2026-33368)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-33368"><img src="https://tridentstack.com/cve/badge/CVE-2026-33368.svg" alt="CVE-2026-33368"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-01.