How severe is CVE-2020-5742?

CVE-2020-5742 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-5742 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5742?

CVE-2020-5742 affects Plex Media Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5742?

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

When was CVE-2020-5742 published?

CVE-2020-5742 was published on 2020-06-15 and last updated on 2026-06-17.

CVE-2020-5742

CVE-2020-5742 is a high-severity vulnerability in Plex Media Server with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Plex Media Server
Published: 2020-06-15
Last modified: 2026-06-17

Description

Improper Access Control in Plex Media Server prior to June 15, 2020 allows any origin to execute cross-origin application requests.

Frequently asked questions

What is CVE-2020-5742?: Improper Access Control in Plex Media Server prior to June 15, 2020 allows any origin to execute cross-origin application requests.
How severe is CVE-2020-5742?: CVE-2020-5742 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-5742 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5742?: CVE-2020-5742 affects Plex Media Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5742?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-5742 published?: CVE-2020-5742 was published on 2020-06-15 and last updated on 2026-06-17.

References

https://www.tenable.com/security/research/tra-2020-35

Affected products (1)

cpe:2.3:a:plex:media_server:*:*:*:*:*:*:*:*

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