CVE-2020-8823

MEDIUMNVD 6.16.1—

6.1

htmlfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile c (aka callback) parameter.

CVSS v3: 6.1
EG Score: 6.1(medium)
EPSS: 73.5%
KEV: Not listed

Published

February 10, 2020

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://github.com/theyiyibest/Reflected-XSS-on-SockJS
cve@mitrehttps://github.com/theyiyibest/Reflected-XSS-on-SockJS/issues/1
cve@mitrehttps://snyk.io/vuln/SNYK-JS-SOCKJS-548397
cve@mitrehttps://www.sockjs.org
af854a3a-2127-422b-91ae-364da2661108https://github.com/theyiyibest/Reflected-XSS-on-SockJS
af854a3a-2127-422b-91ae-364da2661108https://github.com/theyiyibest/Reflected-XSS-on-SockJS/issues/1
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JS-SOCKJS-548397
af854a3a-2127-422b-91ae-364da2661108https://www.sockjs.org

Affected Packages

(1 across 1 ecosystem)

npm(1)

Package	Vulnerable range	Fixed in	Dependents
sockjs	—	0.3.0	—

Weakness Classification(1)

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

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

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

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 08:05 UTCEG score recompute
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2020-8823?

CVE-2020-8823 is a medium vulnerability published on February 10, 2020. htmlfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile c (aka callback) parameter.

When was CVE-2020-8823 disclosed?

CVE-2020-8823 was first published in the National Vulnerability Database on February 10, 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-2020-8823 actively exploited?

CVE-2020-8823 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-8823?

CVE-2020-8823 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2020-8823?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8823, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-8823

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