CVE-2026-73572Medium· 6.1▾ Sunlit

In Zimbra Collaboration (ZCS) before 10.1.17, a stored cross-site scripting (XSS) vulnerability exists in the Zimbra Classic Web Client due to insufficient sanitization of specific attachment content during inline preview

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score34/ 100 · Low

impact 33.6 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Aug 13, 2026

Updated

Aug 21, 2026

CVSS

6.1

Vendor

—

Product

—

CWE

CWE-79

Depth score

34 · Low

EPSS

0.15% · p5

Platforms

—

Source

NVD

Vector

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

EPSS history

Exploit-prediction probability, daily snapshots since Aug 22.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 9 days

Aug 13, 2026Published
Disclosed via NVD
Aug 21, 2026Record revised
Last analysed / modified upstream
Aug 22, 2026EPSS first tracked
0.2%

CWE-79 #nvd

Full technical detail▾

Overview

In Zimbra Collaboration (ZCS) before 10.1.17, a stored cross-site scripting (XSS) vulnerability exists in the Zimbra Classic Web Client due to insufficient sanitization of specific attachment content during inline preview. An attacker can send a crafted email containing a malicious attachment that, when previewed by a user, executes arbitrary JavaScript within the victim's browser session. Successful exploitation may allow an attacker to perform unauthorized actions on behalf of the victim user, potentially leading to data exfiltration or unauthorized access to sensitive information.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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