CVE-2020-15957

HIGH

DP3T-Backend-SDK < 1.1.1 - Improper Verification of Cryptographic Signature via JWT alg=none Bypass

Title source: llm
STIX 2.1

Description

An issue was discovered in DP3T-Backend-SDK before 1.1.1 for Decentralised Privacy-Preserving Proximity Tracing (DP3T). When it is configured to check JWT before uploading/publishing keys, it is possible to skip the signature check by providing a JWT token with alg=none.

References (3)

Core 3
Core References
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/DP-3T/dp3t-sdk-backend/compare/v1.0.4...v1.1.0

Scores

CVSS v3 7.5
EPSS 0.0155
EPSS Percentile 71.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-347
Status published
Products (1)
dp3t-backend-software_development_kit_project/dp3t-backend-software_development_kit < 1.1.1
Published Jul 30, 2020
Tracked Since Feb 18, 2026