CVE-2026-103902 DigiDoc - Authentication Bypass

DigiDoc libdigidocpp 4.0.0 < 4.5.0, DigiDoc4 4.6.0 < 4.11.0, DigiDoc Android 2.7.0 < 3.1.0, and DigiDoc iOS 2.7.0 < 3.1.0 contain an improper verification of cryptographic signature vulnerability caused by flawed signature validation, letting attackers create forged digital signatures, exploit requires crafted signature input.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.15% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Update to libdigidocpp 4.5.0, DigiDoc4 4.11.0, DigiDoc Android 3.1.0, DigiDoc iOS 3.1.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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