CVE-2023-22814: Authentication Bypass issue in My Cloud OS 5 devices

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-01 · updated 2026-06-17
Weakness: CWE-290

Description

An authentication bypass issue via spoofing was discovered in the token-based authentication mechanism that could allow an attacker to carry out an impersonation attack. This issue affects My Cloud OS 5 devices: before 5.26.202.

Affected products

Western Digital My Cloud: from 5.02.104 before 5.26.202 — fixed in 5.26.202

How to fix

Upgrade to a fixed version: Western Digital My Cloud 5.26.202. Check the vendor advisory for mitigations.

References

https://www.westerndigital.com/support/product-security/wdc-23006-my-cloud-firmware-version-5-26-202
https://www.westerndigital.com/support/product-security/wdc-23006-my-cloud-firmware-version-5-26-202

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