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TI-2026-25800 Aliases CVE-2026-33403

Pi-hole has a Reflected XSS / HTML injection in taillog.js

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00195 9th percentileScored 2026-11-07
Fix Fixed web (pi-hole): 6.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Pi-holeweb6.0 to before 6.56.5Patch availableCNA
  • web VendorPi-hole Affected 6.0 to before 6.5 Fixed in 6.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*6.0 – 6.4.1VulnerablePi-hole
  • cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:* Versions 6.0 – 6.4.1 Vulnerable ·Pi-hole

Remediation

  • Fix · CNA web (pi-hole) Fixed in 6.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33403

References

Advisory 1

  • TI-2023-09443 Improper session handling of "Remember me for 7 days" functionality CVSS 3.1HIGH 8.8
  • TI-2025-36756 Pi-hole Admin Interface vulnerable to HTTP response header injection via CRLF injection CVSS 3.1HIGH 8.2
  • TI-2026-25803 Pi-hole has a Stored HTML attribute injection CVSS 3.1MEDIUM 6.1
  • TI-2026-25801 Pi-hole has a Stored XSS / HTML injection in the Network page/Dashboard CVSS 3.1MEDIUM 6.1
  • TI-2025-33477 Pi-hole Admin Interface vulnerable to cross-site scripting via malformed URL path on 404 error page CVSS 4.0MEDIUM 5.1
  • TI-2026-25802 Pi-hole has a Stored HTML Injection in queries.js CVSS 3.1MEDIUM 4.8
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences