Is CVE-2026-91813 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91813 being exploited in the wild.

How severe is CVE-2026-91813?

High severity, with a CVSS score of 8.8, published 23 September 2026.

Which products and versions are affected?

Foxit PDF Editor 2026.2.0.39747 and all previous 2026.x versions, 2025.3.0.35737 and all previous 2025.x versions, 2024.4.1.27687 and all previous 2024.x versions, 2023.3.0.23028 and all previous 2023.x versions, 14.0.7.33751 and all previous 14.x versions, 13.2.6.24111 and earlier; Foxit PDF Reader 2026.2.0.39747 and earlier.

Is there a fix for CVE-2026-91813?

A patch was published on 2026-09-23: Foxit PDF Reader 2026.2.1 and Foxit PDF Editor 2026.2.1/14.0.8 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-91813 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-91813?

Check whether you run Foxit PDF Editor or Foxit PDF Reader at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-91813: Foxit PDF Reader/Editor update mechanism privilege escalation

CVE-2026-91813 · Severity: high · CVSS 8.8 · Published 2026-09-23

Foxit PDF Reader and PDF Editor contain a vulnerability in their automatic update mechanism that allows a local attacker to replace update packages with malicious code before the application extracts and executes them with elevated privileges. An attacker with local access could exploit this to gain administrative control of the system or execute arbitrary commands.

Technologies: Foxit PDF Editor, Foxit PDF Reader. Vendors: Foxit.

Quick answers

Is CVE-2026-91813 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91813 being exploited in the wild.
How severe is CVE-2026-91813?: High severity, with a CVSS score of 8.8, published 23 September 2026.
Which products and versions are affected?: Foxit PDF Editor 2026.2.0.39747 and all previous 2026.x versions, 2025.3.0.35737 and all previous 2025.x versions, 2024.4.1.27687 and all previous 2024.x versions, 2023.3.0.23028 and all previous 2023.x versions, 14.0.7.33751 and all previous 14.x versions, 13.2.6.24111 and earlier; Foxit PDF Reader 2026.2.0.39747 and earlier.
Is there a fix for CVE-2026-91813?: A patch was published on 2026-09-23: Foxit PDF Reader 2026.2.1 and Foxit PDF Editor 2026.2.1/14.0.8 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-91813 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-91813?: Check whether you run Foxit PDF Editor or Foxit PDF Reader at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability stems from insufficient file locking and integrity validation during the update process, allowing a time-of-check-time-of-use (TOCTOU) race condition where an attacker can swap the update package between download and extraction. The flaw requires local system access and affects the Windows update mechanism, enabling arbitrary code execution with the privileges of the PDF application process.

Affected products

Foxit PDF Reader 2026.2.0.39747 and earlier
Foxit PDF Editor 2026.2.0.39747 and all previous 2026.x versions, 2025.3.0.35737 and all previous 2025.x versions, 2024.4.1.27687 and all previous 2024.x versions, 2023.3.0.23028 and all previous 2023.x versions, 14.0.7.33751 and all previous 14.x versions, 13.2.6.24111 and earlier

Timeline

2026-09-23: disclosed: CVE-2026-91813 published on NVD
2026-09-23: patched: Foxit PDF Reader 2026.2.1 and Foxit PDF Editor 2026.2.1/14.0.8 released

References

https://www.foxit.com/support/security-bulletins.html

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