CVE-2022-22999Network attack vector

Session hijacking via unsanitized backup-drive output

Published Jul 25, 2022 · Updated Aug 3, 2024

Stored cross-site scripting in Western Digital MyCloud OS 5 before 5.23.114 allows remote authenticated users to hijack browser sessions. The USB Backups app renders attacker-controlled backup-drive content into the dashboard without output sanitization, allowing injected JavaScript execution. Exploitation requires elevated access to backed-up drives and an authenticated user to view the affected page; the script can steal data, modify settings, or redirect the browser.

CVSS severity4.8
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Western Digital MyCloud OS 5 before 5.23.114 allows remote authenticated users to hijack browser sessions. The USB Backups app renders attacker-controlled backup-drive content into the dashboard without output sanitization, allowing injected JavaScript execution. Exploitation requires elevated access to backed-up drives and an authenticated user to view the affected page; the script can steal data, modify settings, or redirect the browser.

The record

CVE
CVE-2022-22999
Published
Jul 25, 2022
Updated
Aug 3, 2024
Vendor
Western Digital Corporation
Product
My Cloud
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=My Cloud OS 5 <5.23.114

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Western Digital Corporation · My Cloudversion=My Cloud OS 5 <5.23.114

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
8.2Western DigitalCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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