CVE-2026-4947: Insecure Direct Object Reference (IDOR) Leading to Signature Forgery in Foxit eSign

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-01 · updated 2026-06-17
Weakness: CWE-284

Description

Addressed a potential insecure direct object reference (IDOR) vulnerability in the signing invitation acceptance process. Under certain conditions, this issue could have allowed an attacker to access or modify unauthorized resources by manipulating user-supplied object identifiers, potentially leading to forged signatures and compromising the integrity and authenticity of documents undergoing the signing process. The issue was caused by insufficient authorization validation on referenced resources during request processing.

Affected products

Foxit Software Inc. na1.foxitesign.foxit.com: before 2026-03-26 — fixed in 2026-03-26

How to fix

Upgrade to a fixed version: Foxit Software Inc. na1.foxitesign.foxit.com 2026-03-26. Check the vendor advisory for mitigations.

References

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

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