CVE-2026-42838

MEDIUMNVD 5.45.4—

5.4

Improper neutralization of special elements in output used by a downstream component ('injection') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges over a network.

CVSS v3: 5.4
EG Score: 5.4(high)
EPSS: 15.0%
KEV: Not listed

Published

May 12, 2026

Last Modified

May 14, 2026

References (1)

secure@microsofthttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42838

Vendor Advisories for CVE-2026-42838(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-42838
Microsoft Security Response Center (MSRC)Elevation of Privilege
Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

Frequently asked(5)

What is CVE-2026-42838?

CVE-2026-42838 is a medium vulnerability published on May 12, 2026. Improper neutralization of special elements in output used by a downstream component ('injection') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges over a network.

When was CVE-2026-42838 disclosed?

CVE-2026-42838 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-42838 actively exploited?

CVE-2026-42838 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-42838?

CVE-2026-42838 has a CVSS v3 base score of 5.4 (NVD).

How do I remediate CVE-2026-42838?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42838, 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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Frequently asked(5)

What is CVE-2026-42838?

When was CVE-2026-42838 disclosed?

Is CVE-2026-42838 actively exploited?

What is the CVSS score of CVE-2026-42838?

CVE-2026-42838 has a CVSS v3 base score of 5.4 (NVD).

How do I remediate CVE-2026-42838?

CVE-2026-42838

📅 Published

🔄 Last Modified

🔗 References (1)

📣 Vendor Advisories for CVE-2026-42838(1)

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-42838?

CVE-2026-42838

📅 Published

🔄 Last Modified

🔗 References (1)

📣 Vendor Advisories for CVE-2026-42838(1)

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-42838?

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References (1)

Vendor Advisories for CVE-2026-42838(1)

Frequently asked(5)

Published

Last Modified

References (1)

Vendor Advisories for CVE-2026-42838(1)

Frequently asked(5)

Related CVEs(same product + same vendor)