How severe is CVE-2020-7747?

CVE-2020-7747 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2020-7747 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7747?

CVE-2020-7747 affects Lightning-viz Lightning. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7747?

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

When was CVE-2020-7747 published?

CVE-2020-7747 was published on 2020-10-20 and last updated on 2026-06-17.

CVE-2020-7747

CVE-2020-7747 is a medium-severity vulnerability in Lightning-viz Lightning with a CVSS 3.x base score of 6.3. 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 6.3)
CVSS v2: 3.5
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Lightning-viz Lightning
Published: 2020-10-20
Last modified: 2026-06-17

Description

This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.

Frequently asked questions

What is CVE-2020-7747?: This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.
How severe is CVE-2020-7747?: CVE-2020-7747 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2020-7747 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7747?: CVE-2020-7747 affects Lightning-viz Lightning. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7747?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-7747 published?: CVE-2020-7747 was published on 2020-10-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lightning-viz:lightning:*:*:*:*:*:node.js:*:*

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →