CRITICALVulnerability
Verified
Global

Critical SonicWall SMA Gateway Auth Bypass Under Active Exploitation

Thursday, March 5, 2026 at 11:00 AM UTC·Source: SonicWall PSIRT / Arctic Wolf

Updated: Friday, March 6, 2026 at 09:00 AM UTC

Executive Summary

Authentication bypass in SonicWall SMA 1000 series gateways allows unauthenticated admin access. Active exploitation confirmed by CISA.

Analysis

CVE-2026-5135 is a critical authentication bypass in SonicWall SMA 1000 series. Unauthenticated attackers can gain admin access to the management interface and pivot into internal networks. CISA added to KEV catalog after confirming active exploitation. Arctic Wolf observed ransomware deployment following SMA compromise.

Timeline

Discovered
Feb 25, 2026
Exploitation Detected
Mar 1, 2026
Published
Mar 5, 2026
Patch Available
Mar 5, 2026

Indicators of Compromise (1)

CVE (1)
CVE-2026-5135
NVDMITRE CVE
Source Attribution

Originally published by SonicWall PSIRT / Arctic Wolf on Mar 5, 2026. Verified by: CISA, SonicWall, Arctic Wolf.

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