TI-2026-15880 Aliases CVE-2026-19505 GHSA-j328-w5qv-gh82

RDK-B WebUI improper cryptographic signature verification vulnerability

MEDIUM 49CWE-347Published 2026-08-19 · Updated 2026-08-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00511 43rd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
RDK	RDK-B WebUI	rdkb-2025q4-kirkstone	—	No fix listed	CNA

RDK-B WebUI VendorRDK Affected rdkb-2025q4-kirkstone Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-19505
2026-10-03 Alias added: GHSA-j328-w5qv-gh82

References

Other 2

TI-2026-15883 RDK WebUI heap-based buffer overflow vulnerability CVSS 3.1CRITICAL 9.8
TI-2026-15882 RDK WebUI uncontrolled resource consumption CVSS 3.1HIGH 7.5
TI-2026-15881 RDK-B WebUI race condition vulnerability CVSS 3.1HIGH 8.1
TI-2026-15884 RDK WebUI DOS vulnerability CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences