How severe is CVE-2018-8923?

CVE-2018-8923 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2018-8923 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-8923?

CVE-2018-8923 affects Synology File Station. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-8923?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-8923 published?

CVE-2018-8923 was published on 2018-06-05 and last updated on 2026-06-17.

CVE-2018-8923

CVE-2018-8923 is a medium-severity vulnerability in Synology File Station with a CVSS 3.x base score of 6.5. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 3.5
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Synology File Station
Published: 2018-06-05
Last modified: 2026-06-17

Description

Cross-site scripting (XSS) vulnerability in Attachment Preview in Synology File Station before 1.1.4-0122 allows remote authenticated users to inject arbitrary web script or HTML via malicious attachments.

Frequently asked questions

What is CVE-2018-8923?: Cross-site scripting (XSS) vulnerability in Attachment Preview in Synology File Station before 1.1.4-0122 allows remote authenticated users to inject arbitrary web script or HTML via malicious attachments.
How severe is CVE-2018-8923?: CVE-2018-8923 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2018-8923 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-8923?: CVE-2018-8923 affects Synology File Station. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-8923?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-8923 published?: CVE-2018-8923 was published on 2018-06-05 and last updated on 2026-06-17.

References

https://www.synology.com/zh-tw/support/security/Synology_SA_18_09

Affected products (1)

cpe:2.3:a:synology:file_station:*:*:*:*:*:*:*:*

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