CVE-2026-33403: Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker block

Routine

MEDIUM 6.1UPGRADE

CVE-2026-33403 is a medium-severity flaw (CVSS 6.1) affecting web interface. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. From 6.0 to before 6.5, a reflected DOM-based XSS vulnerability in taillog.js allows an unauthenticated attacker to inject arbitrary HTML into the Pi-hole admin interface by crafting a malicious URL. The file query parameter is interpolated into an innerHTML assignment without escaping. Because the Content-Security-Policy

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-06
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: pi-hole

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

Am I affected?

Timeline

2026-04-06 15:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

pi-hole web interface UPGRADE

Affected: >= 6.0 and <= 6.4.1

Fixed in: newer than 6.4.1

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy web-interface || rpm -q web-interface || web-interface --version

2. UPGRADE to newer than 6.4.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade web-interface

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade web-interface

Note

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

3. If no update is available yet, DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison web-interface sudo apt install web-interface=<VERSION_BEFORE_6.0> sudo apt-mark hold web-interface

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list web-interface sudo dnf downgrade web-interface-<VERSION_BEFORE_6.0> sudo dnf versionlock add web-interface

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-33403?

web interface: upgrade to newer than 6.4.1. Exact commands for each OS are on this page.

Is CVE-2026-33403 being exploited?

CVE-2026-33403 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-2026-33403 affect?

CVE-2026-33403 affects web interface. Severity is medium (CVSS 6.1). Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. From 6.0 to before 6.5, a reflected DOM-based XSS vulnerability in taillog.js allows an unauthenticated attacker

How urgent is CVE-2026-33403?

Priority 23/100. No elevated risk signals yet.

Related CVEs

CVE-2026-33765 CRITICAL 9.8 UPGRADE Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker block
CVE-2026-33406 MEDIUM 5.4 UPGRADE Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker block
CVE-2026-33404 LOW 3.4 UPGRADE Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker block
CVE-2026-33405 LOW 3.1 UPGRADE Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker block

References

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