CVE-2026-59163 Mnemosyne - Authentication Bypass

Mnemosyne < 3.10.1 contains a broken authentication caused by disabled JWT signature verification in sync_server.py, letting attackers bypass authentication with any well-formed token, exploit requires network access to the sync server endpoint.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.33% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Upgrade to version 3.10.1 or later; restrict network access to the sync server endpoint until upgrade.

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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