Medium severity · published Aug 13, 2026
CVE-2026-73574
In Zimbra Collaboration before 10.1.17, a local file inclusion (LFI) vulnerability exists in the Zimbra Classic Web Client due to improper validation of the fu request parameter
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
In Zimbra Collaboration before 10.1.17, a local file inclusion (LFI) vulnerability exists in the Zimbra Classic Web Client due to improper validation of the fu request parameter. An unauthenticated attacker can exploit this vulnerability by supplying a crafted path, potentially allowing unauthorized disclosure of protected files, such as WEB-INF/web.xml, within the web application directory. This occurs in the Forward servlet.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
Collaboration · Zimbra
before 10.1.17 · source: vendor
ZC
Zimbra Collaboration Suite · Synacor
before 10.1.17 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73574
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73574
Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
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