Improper Signature Verification in DigiDoc Products by DigiDoc
CVE-2026-103902

7.5HIGH

Key Information:

Vendor

Digidoc

Status
Libdigidocpp
Digidoc4
Digidoc Android
Digidoc iOS
Vendor
CVE Published:
12 October 2026

What is CVE-2026-103902?

A vulnerability exists in DigiDoc software that stems from improper verification of cryptographic signatures. This flaw enables attackers to create forged digital signatures that the affected DigiDoc applications treat as valid. The issue impacts multiple versions of core DigiDoc products, including libdigidocpp, DigiDoc4, and mobile DigiDoc applications for both Android and iOS. Organizations using these products should review the affected versions and apply necessary updates to mitigate the risk of unauthorized signature acceptance.

Affected Version(s)

DigiDoc Android 2.7.0 < 3.1.0

DigiDoc iOS 2.7.0 < 3.1.0

DigiDoc4 4.6.0 < 4.11.0

References

https://github.com/open-eid/libdigidocpp/pull/735
patch
https://www.id.ee/en/article/id-tarkvara-uus-versioon-267...
government-resource

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.