CVE-2026-62803: Improper link resolution before file access ('link following') in Windows DHCP Server allows an authorized att

Q: How do I fix CVE-2026-62803?

windows 10 1607: upgrade to 10.0.14393.9418; windows 10 1809: upgrade to 10.0.17763.9115; windows server 2012: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-62803 being exploited?

CVE-2026-62803 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-2026-62803 affect?

CVE-2026-62803 affects windows 10 1607, windows 10 1809, windows server 2012. Severity is high (CVSS 7.8). Improper link resolution before file access ('link following') in Windows DHCP Server allows an authorized attacker to elevate privileges locally.

Q: How urgent is CVE-2026-62803?

Priority 40/100. High severity; On your watchlist

This month

HIGH 7.8WATCHLISTUPGRADEUPGRADEMITIGATE

CVE-2026-62803 is a high-severity flaw (CVSS 7.8) affecting windows 10 1607, windows 10 1809, windows server 2012. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper link resolution before file access ('link following') in Windows DHCP Server allows an authorized attacker to elevate privileges locally.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-59
Published	2026-08-11
Last modified	2026-09-02

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-09-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-11 17:18 UTCPublished CVE record published
2026-09-02 18:20 UTCUpdated Record last modified

microsoft windows 10 1607 UPGRADE

Affected: < 10.0.14393.9418

Fixed in: 10.0.14393.9418

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows 10 1809 UPGRADE

Affected: < 10.0.17763.9115

Fixed in: 10.0.17763.9115

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows server 2012 MITIGATE

Affected: all versions · r2

Fixed in: no fixed release known

Safe to downgrade to: a release before r2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows server 2016 UPGRADE

Affected: < 10.0.14393.9418

Fixed in: 10.0.14393.9418

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows server 2019 UPGRADE

Affected: < 10.0.17763.9115

Fixed in: 10.0.17763.9115

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

microsoft windows server 2022 UPGRADE

Affected: < 10.0.20348.5440

Fixed in: 10.0.20348.5440

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2026-62803?

windows 10 1607: upgrade to 10.0.14393.9418; windows 10 1809: upgrade to 10.0.17763.9115; windows server 2012: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-62803 being exploited?

CVE-2026-62803 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-2026-62803 affect?

CVE-2026-62803 affects windows 10 1607, windows 10 1809, windows server 2012. Severity is high (CVSS 7.8). Improper link resolution before file access ('link following') in Windows DHCP Server allows an authorized attacker to elevate privileges locally.

How urgent is CVE-2026-62803?

Priority 40/100. High severity; On your watchlist

Software pages

Windows vulnerabilities · Windows Server vulnerabilities

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References

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