CVE-2026-103902
High
Description
Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures that are displayed a valid by affected DigiDoc software.This issue affects libdigidocpp: from 4.0.0 before 4.5.0; DigiDoc4: from 4.6.0 before 4.11.0; DigiDoc Android: from 2.7.0 before 3.1.0; DigiDoc iOS: from 2.7.0 before 3.1.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductLibdigidocpp
PublishedOct 12, 2026
First seenOct 12, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- DigiDoc libdigidocpp4.5.0 or later
- DigiDoc DigiDoc44.11.0 or later
- DigiDoc DigiDoc Android3.1.0 or later
- DigiDoc DigiDoc iOS3.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| DigiDoc libdigidocpp | 4.0.0 ≤ v < 4.5.0 | 4.5.0 |
| DigiDoc DigiDoc4 | 4.6.0 ≤ v < 4.11.0 | 4.11.0 |
| DigiDoc DigiDoc Android | 2.7.0 ≤ v < 3.1.0 | 3.1.0 |
| DigiDoc DigiDoc iOS | 2.7.0 ≤ v < 3.1.0 | 3.1.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.