CVE-2026-91813Hinoki check available

Local privilege escalation via update package replacement

Published Sep 23, 2026 · Updated Sep 23, 2026

A TOCTOU race in Foxit PDF Reader and PDF Editor for Windows allows local users to execute arbitrary code with elevated privileges. FoxitUpdater insufficiently locks and integrity-checks an update package, allowing replacement after download but before high-privilege extraction. A low-privileged local account and a successful race are required; affected releases are Reader 2026.2 and earlier and Editor 13.2.6, 14.0.7, and 2026.2 and earlier on Windows.

CVSS severity8.8
High
EPSS probability0.09%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A TOCTOU race in Foxit PDF Reader and PDF Editor for Windows allows local users to execute arbitrary code with elevated privileges. FoxitUpdater insufficiently locks and integrity-checks an update package, allowing replacement after download but before high-privilege extraction. A low-privileged local account and a successful race are required; affected releases are Reader 2026.2 and earlier and Editor 13.2.6, 14.0.7, and 2026.2 and earlier on Windows.

The record

CVE
CVE-2026-91813
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
Foxit Software Company
Product
Foxit PDF Reader
Classifications
CWE-367, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Versions 2026.2 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Foxit Software Company · Foxit PDF Readerversion=Versions 2026.2 and earlier
Foxit Software Company · Foxit PDF Editorversion=Versions 13.2.6 and earlier; version=Versions 14.0.7 and earlier; version=Versions 2026.2 and earlier

Published CVSS scores

8.8Foxit SoftwareCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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