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CVE-2020-15957

19
FAUCET Score

CVE-2020-15957 is a critical vulnerability affecting DP3T-Backend-SDK versions prior to 1.1.1, where an attacker could bypass JWT signature checks by providing a token with "alg=none" when the system is configured to validate JWTs before key uploads. This high-severity vulnerability (CVSS 7.5) allows for unauthorized key publication, leading to a high impact on integrity without requiring user interaction or authentication. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.1.1CPE matchmatch criteria
cpe:2.3:a:dp3t-backend-software_development_kit_project:dp3t-backend-software_development_kit:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.55%
Probability of exploitation in next 30 days
EPSS Percentile
72.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0155 is in the 54th percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / dp-3T/dp3t-sdk-backend
Third Party Advisory
github.com / DP-3T/dp3t-sdk-backend/compare/v1.0.4...v1.1.0
Release NotesThird Party Advisory
github.com / DP-3T/dp3t-sdk-backend/security/advisories/GHSA-5m5q-3qw2-3xf3
PatchThird Party Advisory