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CVE-2026-21003

MediumPublished

Improper input validation in data related to network restrictions prior to SMR Apr-2026 Release 1 allows physical attackers to bypass the restrictions.

Published: Apr 13, 2026
Updated: Apr 13, 2026
Assigning CNA: SamsungMobile
Evidence observed: Aug 13, 2026

Primary CVSS

5.2/ 10Medium

nvd · CVSS 4.0

CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 5.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Improper input validation in data related to network restrictions prior to SMR Apr-2026 Release 1 allows physical attackers to bypass the restrictions.

Sources

CVE-2026-21003-JWT-none-Algorithm-Bypass-via-kid-Header-OmissionPoC
Proof-of-concept exploit for CVE-2026-21003 demonstrating JWT authentication bypass by omitting the kid header and using the 'none' algorithm to impersonate users.

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