High severity · published Sep 23, 2026
CVE-2026-91812
Foxit PDF Editor/Reader FoxitUpdater Improper Certificate Validation Local Privilege Escalation Vulnerability
8.1
CVSS
0.1%
EPSS
No
On KEV
Description
A vulnerability in Foxit PDF Editor/Reader’s update mechanism allows man-in-the-middle attackers to bypass certificate validation and package integrity checks, potentially enabling arbitrary code execution with system privileges.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FP
Foxit PDF Editor · Foxit Software Inc.
Versions 2026.2 and earlier; Versions 14.0.7 and earlier; Versions 13.2.6 and earlier · source: vendor
FP
Foxit PDF Reader · Foxit Software Inc.
Versions 2026.2 and earlier · source: vendor
PE
Pdf Editor · Foxit
through 13.2.5.63482; 14.0.0.33046 through 14.0.7.33751; 2023.1.0.15510 through 2023.3.0.23028; 2024.1.0.23997 through 2024.4.1.27687; 2025.1.0.27937 through 2025.3.0.35737; 2026.1.0.36452 through 2026.2.0.39747 · source: NVD
PR
Pdf Reader · Foxit
through 2026.2.0.39747 · source: NVD
In the news
VulnerabilityHigh
ZDI-26-741: Foxit PDF Reader FoxitUpdater Improper Certificate Validation Local Privilege Escalation Vulnerability
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Foxit PDF Reader. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.1. The following CVEs are assigned: CVE-2026-91812.
Sep 23, 2026·Zero Day Initiative
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91812
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91812
Vendor Advisory
https://www.foxit.com/support/security-bulletins.html
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