CVE-2026-42838: Improper neutralization of special elements in output used by a downstream component ('injection') in Microsof

Q: How do I fix CVE-2026-42838?

edge chromium: upgrade to 148.0.3967.55. Exact commands for each OS are on this page.

Q: Is CVE-2026-42838 being exploited?

CVE-2026-42838 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42838 affect?

CVE-2026-42838 affects edge chromium. Severity is medium (CVSS 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.

Q: How urgent is CVE-2026-42838?

Priority 28/100. On your watchlist

Routine

MEDIUM 5.4WATCHLISTUPGRADE

CVE-2026-42838 is a medium-severity flaw (CVSS 5.4) affecting edge chromium. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-74
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 18:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

microsoft edge chromium UPGRADE

Affected: < 148.0.3967.55

Fixed in: 148.0.3967.55

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy edge-chromium || rpm -q edge-chromium || edge-chromium --version

2. UPGRADE to 148.0.3967.55 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade edge-chromium

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade edge-chromium

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42838?

edge chromium: upgrade to 148.0.3967.55. Exact commands for each OS are on this page.

Is CVE-2026-42838 being exploited?

CVE-2026-42838 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42838 affect?

CVE-2026-42838 affects edge chromium. Severity is medium (CVSS 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.

How urgent is CVE-2026-42838?

Priority 28/100. On your watchlist

Software pages

Microsoft Edge vulnerabilities · Chromium vulnerabilities

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References

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