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CVE-2020-7747

22
FAUCET Score

CVE-2020-7747 is a medium-severity cross-site scripting (XSS) vulnerability affecting all versions of the lightning-server package, including lightning-viz and lightning. An authenticated attacker can inject malicious JavaScript code through the session controller. This vulnerability has a CVSS score of 6.3, indicating a network attack vector with low complexity, requiring user interaction, and potentially leading to high confidentiality impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:lightning-viz:lightning:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.86%
Probability of exploitation in next 30 days
EPSS Percentile
54.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0086 is in the 89th percentile among its peer group of 15,224 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-gmch-cm2p-9qw9medium

Cross-site Scripting in lightning-server

May 10, 2021

References

github.com / lightning-viz/lightning/blob/master/app/controllers/session.js
ExploitVendor Advisory
github.com / lightning-viz/lightning/blob/master/app/controllers/session.js%23L230
Broken Link
snyk.io / vuln/SNYK-JS-LIGHTNINGSERVER-1019381
ExploitThird Party Advisory