CVE-2026-91814

Security vulnerability: Foxit PDF Editor/Reader Fails to Detect Modifications to Signed Documents Displaying Newly Added Content

State: Published
Severity: 5.3 Medium
Published: Sep 23, 2026
Updated: Sep 23, 2026
Reserved: Sep 15, 2026

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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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N	Foxit

Weaknesses

CWE-347 Improper Verification of Cryptographic Signature

Affected Products

Product	Versions
Foxit PDF EditorFoxit Software Inc.	Versions 2026.2 and earlierAffected Versions 14.0.7 and earlierAffected Versions 13.2.6 and earlierAffected
Foxit PDF ReaderFoxit Software Inc.	Versions 2026.2 and earlierAffected

References

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

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