How severe is CVE-2026-33403?

CVE-2026-33403 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-33403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33403?

CVE-2026-33403 affects Pi-hole Web Interface. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33403 have an EU (EUVD) identifier?

Yes. CVE-2026-33403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19279.

When was CVE-2026-33403 published?

CVE-2026-33403 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-33403

CVE-2026-33403 is a medium-severity vulnerability in Pi-hole Web Interface with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19279
Weakness: CWE-79
Affected product: Pi-hole Web Interface
Published: 2026-04-06
Last modified: 2026-06-17

Description

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 is missing the form-action directive, injected <form> elements can exfiltrate credentials to an external origin. This vulnerability is fixed in 6.5.

Frequently asked questions

What is CVE-2026-33403?: 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 is missing the form-action directive, injected <form> elements can exfiltrate credentials to an external origin. This vulnerability is fixed in 6.5.
How severe is CVE-2026-33403?: CVE-2026-33403 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-33403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33403?: CVE-2026-33403 affects Pi-hole Web Interface. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33403 have an EU (EUVD) identifier?: Yes. CVE-2026-33403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19279.
When was CVE-2026-33403 published?: CVE-2026-33403 was published on 2026-04-06 and last updated on 2026-06-17.

References

https://github.com/pi-hole/web/security/advisories/GHSA-7xqw-r9pr-qv59

Affected products (1)

cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*

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