How severe is CVE-2018-20859?

CVE-2018-20859 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-20859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20859?

CVE-2018-20859 affects Edx Edx-platform. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20859?

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

When was CVE-2018-20859 published?

CVE-2018-20859 was published on 2019-07-30 and last updated on 2026-06-17.

CVE-2018-20859

CVE-2018-20859 is a medium-severity vulnerability in Edx Edx-platform with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Edx Edx-platform
Published: 2019-07-30
Last modified: 2026-06-17

Description

edx-platform before 2018-07-18 allows XSS via a response to a Chemical Equation advanced problem.

Frequently asked questions

What is CVE-2018-20859?: edx-platform before 2018-07-18 allows XSS via a response to a Chemical Equation advanced problem.
How severe is CVE-2018-20859?: CVE-2018-20859 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-20859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20859?: CVE-2018-20859 affects Edx Edx-platform. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20859 published?: CVE-2018-20859 was published on 2019-07-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:edx:edx-platform:*:*:*:*:*:*:*:*

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