How severe is CVE-2018-9148?

CVE-2018-9148 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-9148 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9148?

CVE-2018-9148 affects Westerndigital My Cloud Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9148?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-9148 published?

CVE-2018-9148 was published on 2018-03-30 and last updated on 2026-06-17.

CVE-2018-9148

CVE-2018-9148 is a critical-severity vulnerability in Westerndigital My Cloud Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Westerndigital My Cloud Firmware
Published: 2018-03-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-9148?: 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.
How severe is CVE-2018-9148?: CVE-2018-9148 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-9148 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9148?: CVE-2018-9148 affects Westerndigital My Cloud Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9148?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-9148 published?: CVE-2018-9148 was published on 2018-03-30 and last updated on 2026-06-17.

References

https://exploit-db.com/exploits/44350/

Affected products (1)

cpe:2.3:o:westerndigital:my_cloud_firmware:04.05.00-320:*:*:*:*:*:*:*

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