CVE-2026-91814

Description

A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the document continues to appear validly signed.

Overview

State: PUBLISHED
Assigner (CNA): Foxit
CVSS severity: MEDIUM
CVSS score: 5.3 / 10
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Effective score: 5.3 / 10 MEDIUM source: CNA overview
CWE(s): CWE-347
Reserved: 2026-09-15
Published: 2026-09-23 07:49 UTC
Last updated: 2026-09-23 14:24 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/91xxx/CVE-2026-91814.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-23 08:17:13 UTC
NVD last modified: 2026-09-23 17:58:26 UTC
NVD CVSS v3.1: 5.3 / 10 MEDIUM source: 14984358-7092-470d-8f34-ade47a7658a2
NVD CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Exploitability subscore: 1.6 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.0017 (probability of exploitation in next 30 days)
EPSS percentile: 6.96% vs all CVEs — higher = more likely to be exploited, as of 2026-09-23

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85159
Assigner: Foxit
Published: Sep 23, 2026, 7:49:25 AM
Updated: Sep 23, 2026, 2:24:20 PM
EUVD base score (CVSS 3.1): 5.3 / 10
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
EUVD-reported EPSS: 0.1700
Vendors: Foxit Software Inc.
Products: Foxit PDF Editor (Versions 2026.2 and earlier)

Foxit PDF Editor (Versions 13.2.6 and earlier)

Foxit PDF Editor (Versions 14.0.7 and earlier)

Foxit PDF Reader (Versions 2026.2 and earlier)
Aliases: GHSA-c9r7-69j9-jq5j

ENISA description: A signature validation vulnerability exists in Foxit PDF Editor/Reader’s handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the document continues to appear validly signed.

EUVD references (1)

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

Affected products (2)

Vendor	Product	Versions	Platforms
Foxit Software Inc.	Foxit PDF Editor	`Versions 2026.2 and earlier` (affected), `Versions 14.0.7 and earlier` (affected), `Versions 13.2.6 and earlier` (affected)	Windows, MacOS
Foxit Software Inc.	Foxit PDF Reader	`Versions 2026.2 and earlier` (affected)	Windows, MacOS

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

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

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://www.foxit.com/support/security-bulletins.html 14984358-7092-470d-8f34-ade47a7658a2

Remediations (10)

CVE-2026-18141 - Red Hat Customer Portal

web:access.redhat.com

Overall, you have the following options: Upgrade to a supported product version that includes a fix for this vulnerability (recommended). Apply a mitigation (if one exists). Customers with the Technical Account Manager (TAM) RHEL Security Select Add-on can review this CVE directly with their TAM.

2026-09-24 11:47 UTC
CVE-2026-69414 ShieldBreak Zero-Day: No Patch, and CISA BOD 26-04 Gives ...

web:blog.qualys.com

What can I do before Microsoft releases a patch ? Qualys TruRisk™ Eliminate provides a recommended mitigation for CVE - 2026 -69414 that can be applied to affected systems while Microsoft works on a fix . Assets can then be reassessed in Qualys VMDR to verify the remediation outcome.

2026-09-24 11:47 UTC
Adobe Security Bulletin

web:helpx.adobe.com

Adobe has released a security update for Adobe Acrobat and Reader for Windows and macOS. This update addresses critical, important, and moderate vulnerabilities that could result in arbitrary code execution, privilege escalation, arbitrary file system read, arbitrary file system write, memory exposure, and application denial-of-service. Adobe is not aware of any exploits in the wild for any of ...

2026-09-24 11:47 UTC
Adobe Security Bulletins and Advisories | Security

web:helpx.adobe.com

This page contains important information regarding security vulnerabilities that could affect specific versions of Adobe products. Use this information to take the prescribed corrective actions.

2026-09-24 11:47 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-24 11:47 UTC
CVE-2026-91814 - vulnerability database | Vulners.com

web:vulners.com

CVE-2026-91814 🗓️ 23 Sep 2026 00:49:25 Reported by Foxit Type cve 🔗 web.nvd.nist.gov 👁 4 Views

2026-09-24 11:47 UTC
Critical Patches Issued for Microsoft Products, July 14, 2026

web:www.cisecurity.org

Microsoft reports CVE - 2026 -56164 has been exploited in the wild. CVE - 2026 -56164 may allow remote cyber threat actors to gain unauthorized access to on-premises SharePoint Server instances. Microsoft noted that integrating its Antimalware Scan Interface (AMSI) can provide temporary mitigation by actively scanning and detecting malicious POST requests associated with exploitation attempts. The ...

2026-09-24 11:47 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-24 11:47 UTC
CVE-2026-91814: Foxit Software Inc.: A signature validation ... - Rapid7

web:www.rapid7.com

CVE-2026-91814 : Foxit Software Inc.: A signature validation vulnerability exists in Foxit PDF Editor/Reader's handling of incrementally updated PDF documents. View severity, references, and remediation details from Rapid7.

2026-09-24 11:47 UTC
CVE-2026-91814 | Tenable®

web:www.tenable.com

A signature validation vulnerability exists in Foxit PDF Editor/Reader's handling of incrementally updated PDF documents. Changes to visible document content may not invalidate the existing signature, allowing attackers to alter signed content and potentially carry out content spoofing while the document continues to appear validly signed.

2026-09-24 11:47 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-91814.json.

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