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Fencer Intel
medium 6.3

CVE-2020-7747 json

Cross-site Scripting (XSS)

published 6y ago modified 4mo ago also GHSA-gmch-cm2p-9qw9 , EUVD-2021-1081

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

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

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Exploit prediction

0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-LIGHTNINGSERVER-1019381 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/lightning-viz/lightning/blob/master/app/controllers/session.js referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N/E:P/RL:U/RC:C
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm lightning-server
<=1.3.0
 no fix listed

Affected products

  • n/a lightning-server

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.