High severity · published Oct 12, 2026
CVE-2026-103902
DigiDoc improper signature verification
7.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DA
DigiDoc Android · DigiDoc
2.7.0 before 3.1.0 · source: vendor
DI
DigiDoc iOS · DigiDoc
2.7.0 before 3.1.0 · source: vendor
DI
DigiDoc4 · DigiDoc
4.6.0 before 4.11.0 · source: vendor
LI
libdigidocpp · DigiDoc
4.0.0 before 4.5.0 · source: vendor