CVE-2026-39837

MEDIUMNVD 5.45.4—Elevated

5.4

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

CVSS v3: 5.4
EG Score: 5.4(medium)
EPSS: 10.0%
KEV: Not listed

Published

April 7, 2026

Last Modified

April 15, 2026

References (2)

c4f26cc8-17ff-4c99-b5e2-38fc1793eacchttps://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237979
c4f26cc8-17ff-4c99-b5e2-38fc1793eacchttps://phabricator.wikimedia.org/T416402

Weakness Classification(1)

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

CWE-80Improper Neutralization of Script-Related HTML Tags

Data Freshness Timeline

(refreshed 16× in last 7d / 20× 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.

2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:16 UTCepss_batch
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2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
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2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 18:36 UTCEG score recompute
2026-05-20 18:36 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-39837?

CVE-2026-39837 is a medium vulnerability published on April 7, 2026. Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

When was CVE-2026-39837 disclosed?

CVE-2026-39837 was first published in the National Vulnerability Database on April 7, 2026, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-39837 actively exploited?

CVE-2026-39837 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-39837?

CVE-2026-39837 has a CVSS v3 base score of 5.4 (NVD).

How do I remediate CVE-2026-39837?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39837, 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

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CVE-2026-39837

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-39837?

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Published

Last Modified

References (2)

Frequently asked(5)

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