CVE-2020-7747

MEDIUMNVD 6.36.3—

6.3

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

CVSS v3: 6.3
EG Score: 6.3(medium)
EPSS: 63.4%
KEV: Not listed

Published

October 20, 2020

Last Modified

November 21, 2024

References (5)

report@snykhttps://github.com/lightning-viz/lightning/blob/master/app/controllers/session.js%23L230
report@snykhttps://snyk.io/vuln/SNYK-JS-LIGHTNINGSERVER-1019381
nvd@nisthttps://github.com/lightning-viz/lightning/blob/master/app/controllers/session.js
af854a3a-2127-422b-91ae-364da2661108https://github.com/lightning-viz/lightning/blob/master/app/controllers/session.js%23L230
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JS-LIGHTNINGSERVER-1019381

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
npm	lightning-server	—	ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

npm(1)

Package	Vulnerable range	Fixed in	Dependents
lightning-server	—	—	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-7747?

CVE-2020-7747 is a medium vulnerability published on October 20, 2020. This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.

When was CVE-2020-7747 disclosed?

CVE-2020-7747 was first published in the National Vulnerability Database on October 20, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-7747 actively exploited?

CVE-2020-7747 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-7747?

CVE-2020-7747 has a CVSS v3 base score of 6.3 (NVD).

How do I remediate CVE-2020-7747?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-7747, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-7747

📅 Published

🔄 Last Modified

🔗 References (5)