CVE-2020-7747
Cross-site Scripting (XSS)
This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Cross-site Scripting (XSS)
This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.
- Record
CVE-2020-7747- CVSS 3.1
- 6.3 Medium
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 - Updated
- 2026-11-02
EUVDEUVD-2021-1081
This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.
- Record
EUVD-2021-1081- CVSS 3.1
- 6.3 Medium
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 - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gmch-cm2p-9qw9
Cross-site Scripting in lightning-server
This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.
- Record
GHSA-gmch-cm2p-9qw9- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.
- Record
CVE-2020-7747- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-gmch-cm2p-9qw9
Cross-site Scripting in lightning-server
This affects all versions of package lightning-server. It is possible to inject malicious JavaScript code as part of a session controller.
- Record
GHSA-gmch-cm2p-9qw9- CVSS 3.1
- 6.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
lightning-servernpm |
through 1.3.0 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-7747 is a medium vulnerability (CVSS 6.3) in Lightning-viz Lightning, published October 20, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.86%, the 58th percentile. No source names a fixed version.