CVE-2026-19505
Critical · 9.8CVSS
9.8
EPSS
0.4%
Published
Aug 19, 2026
CISA due date
—
The record
Improper cryptographic signature verification in `jst_functions.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote attacker to bypass authentication and obtain administrative access via a forged JWT containing an invalid RSA signature.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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