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Vulnerability record · CVE-2018-9148 · published 30 March 2018

CVE-2018-9148: Westerndigital my cloud firmware improper authentication vulnerability

Westerndigital · My Cloud Firmware

Western Digital WD My Cloud v04.05.00-320 devices embed the session token (aka PHPSESSID) in filenames, which makes it easier for attackers to bypass authentication by listing a directory. NOTE: this can be exploited in conjunction with CVE-2018-7171 for remote authentication bypass within a product that uses My Cloud.

9.8 CVSS 3.0 Critical EPSS 3.6% · top 10.9% CWE-287 · Improper authentication
9.8CVSS 3.0 base score, v2 5.0
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Western Digital WD My Cloud v04.05.00-320 devices embed the session token (aka PHPSESSID) in filenames, which makes it easier for attackers to bypass authentication by listing a directory. NOTE: this can be exploited in conjunction with CVE-2018-7171 for remote authentication bypass within a product that uses My Cloud.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://exploit-db.com/exploits/44350/ ExploitThird Party AdvisoryVDB Entry
https://exploit-db.com/exploits/44350/ ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-22995Westerndigital my cloud pr2100 firmware link following vulnerabilityThe combination of primitives offered by SMB and AFP in their default configuration allows the arbitrary writing of files. By exploiting these combin…EPSS 2.7%9.8CVE-2020-27744Westerndigital my cloud firmware os command injection vulnerabilityAn issue was discovered on Western Digital My Cloud NAS devices before 5.04.114. They allow remote code execution with resultant escalation of privil…EPSS 6.2%9.8CVE-2020-27158Westerndigital my cloud firmware os command injection vulnerabilityAddressed remote code execution vulnerability in cgi_api.php that allowed escalation of privileges in Western Digital My Cloud NAS devices prior to 5…EPSS 7.5%9.8CVE-2020-27159Westerndigital my cloud firmware os command injection vulnerabilityAddressed remote code execution vulnerability in DsdkProxy.php due to insufficient sanitization and insufficient validation of user input in Western …EPSS 6.2%9.8CVE-2020-27160Westerndigital my cloud firmware path traversal vulnerabilityAddressed remote code execution vulnerability in AvailableApps.php that allowed escalation of privileges in Western Digital My Cloud NAS devices prio…EPSS 4.9%9.8CVE-2020-12830Westerndigital my cloud firmware out-of-bounds write vulnerabilityAddressed multiple stack buffer overflow vulnerabilities that could allow an attacker to carry out escalation of privileges through unauthorized remo…EPSS 3.3%9.8CVE-2020-25765Westerndigital my cloud firmware improper input validation vulnerabilityAddressed remote code execution vulnerability in reg_device.php due to insufficient validation of user input.in Western Digital My Cloud Devices prio…EPSS 6.1%9.8CVE-2019-9950Westerndigital my cloud firmware weak password requirements vulnerabilityWestern Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud DL2100, My Cloud DL4100, My Cloud PR21…EPSS 2.3%

Source: NIST National Vulnerability Database (record CVE-2018-9148), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.