CVE-2026-111090 MyStormshield - Authentication Bypass

MyStormshield contains a broken authentication caused by a logic error in the signature verification routine, letting attackers accept unauthenticated update and license files, exploit requires use of non-MyStormshield servers or lack of automatic SNS verification.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
20 October 2026
Updated
20 October 2026
Weakness
CWE-287

Vendor fix

Use only MyStormshield servers for updates or enable automatic verification via SNS.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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