CVE-2020-8127

MEDIUMNVD 6.16.1—

6.1

Insufficient validation in cross-origin communication (postMessage) in reveal.js version 3.9.1 and earlier allow attackers to perform cross-site scripting attacks.

CVSS v3: 6.1
EG Score: 6.1(medium)
EPSS: 67.6%
KEV: Not listed

Published

February 28, 2020

Last Modified

November 21, 2024

References (2)

support@hackeronehttps://hackerone.com/reports/691977
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/691977

Affected Packages

(1 across 1 ecosystem)

npm(1)

Package	Vulnerable range	Fixed in	Dependents
reveal.js	—	3.9.2	—

Weakness Classification(1)

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

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 8× in last 7d / 8× 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 07:10 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
2026-05-23 16:35 UTCOSV refresh

Frequently asked(5)

What is CVE-2020-8127?

CVE-2020-8127 is a medium vulnerability published on February 28, 2020. Insufficient validation in cross-origin communication (postMessage) in reveal.js version 3.9.1 and earlier allow attackers to perform cross-site scripting attacks.

When was CVE-2020-8127 disclosed?

CVE-2020-8127 was first published in the National Vulnerability Database on February 28, 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-2020-8127 actively exploited?

CVE-2020-8127 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-8127?

CVE-2020-8127 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2020-8127?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8127, 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-2020-8127

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