---
title: "CVE-2026-91813: Foxit PDF Editor/Reader - Privilege Escalation"
description: "Foxit PDF Editor/Reader contains a privilege escalation vulnerability caused by insufficient file locking and integrity validation in the update mechanism, letting local attackers execute arbitrary code with elevated privileges, exploit requires local access."
url: https://panop.io/threat-heartbeat/CVE-2026-91813/
---

# CVE-2026-91813 Foxit PDF Editor/Reader - Privilege Escalation

Foxit PDF Editor/Reader contains a privilege escalation vulnerability caused by insufficient file locking and integrity validation in the update mechanism, letting local attackers execute arbitrary code with elevated privileges, exploit requires local access.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.09% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91813)

## Details

Type

Privilege Escalation

Impact

Remote Code Execution, Privilege Escalation

CVSS vector

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

Published

23 September 2026

Updated

15 October 2026

Weakness

[CWE-367](https://cwe.mitre.org/data/definitions/367.html)

## Vendor fix

Update to the latest version with fixed update mechanism.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91813](https://nvd.nist.gov/vuln/detail/CVE-2026-91813)
- [https://www.foxit.com/support/security-bulletins.html](https://www.foxit.com/support/security-bulletins.html)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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