CVE-2021-41038

MEDIUMNVD 6.16.1—

6.1

In versions of the @theia/plugin-ext component of Eclipse Theia prior to 1.18.0, Webview contents can be hijacked via postMessage().

CVSS v3: 6.1
EG Score: 6.1(medium)
EPSS: 33.8%
KEV: Not listed

Published

November 10, 2021

Last Modified

November 21, 2024

References (4)

emo@eclipsehttps://bugs.eclipse.org/bugs/show_bug.cgi?id=575924
emo@eclipsehttps://github.com/eclipse-theia/theia/pull/10125
af854a3a-2127-422b-91ae-364da2661108https://bugs.eclipse.org/bugs/show_bug.cgi?id=575924
af854a3a-2127-422b-91ae-364da2661108https://github.com/eclipse-theia/theia/pull/10125

Affected Packages

(1 across 1 ecosystem)

npm(1)

Package	Vulnerable range	Fixed in	Dependents
@theia/plugin-ext	—	1.18.0	—

Weakness Classification(1)

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

CWE-940

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

Frequently asked(5)

What is CVE-2021-41038?

CVE-2021-41038 is a medium vulnerability published on November 10, 2021. In versions of the @theia/plugin-ext component of Eclipse Theia prior to 1.18.0, Webview contents can be hijacked via postMessage().

When was CVE-2021-41038 disclosed?

CVE-2021-41038 was first published in the National Vulnerability Database on November 10, 2021, 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-2021-41038 actively exploited?

CVE-2021-41038 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-41038?

CVE-2021-41038 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2021-41038?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-41038, 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-2021-41038

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