CVE-2026-117645
Full vulnerability record from the local CVENow database.
Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in phoenixframework phoenix_html allows an attacker who controls attribute names to inject attributes and script into rendered HTML via Phoenix.HTML.attributes_escape/1. attributes_escape/1 in lib/phoenix_html.ex escapes attribute values but not attribute names. key_escape/1 passes a binary key through html_escape, which neutralizes quotes and angle brackets but not whitespace, so a key such as x onmouseover ends the attribute and starts a new one. An atom key is only dasherized, so any character passes, including quotes and >. Nested data, aria and phx keys take the same paths. An application is affected when it builds attribute keys from untrusted input and renders them through HEEx <tag {@attrs}>, content_tag/3, or a direct call. Before 3.0.0 the same code lived in Phoenix.HTML.Tag. This issue affects phoenix_html: from 1.0.0 before 3.3.5 and from 4.0.0 before 4.4.0.
Severity
MEDIUM
CVSS score
5.3
(v4.0)
Vulnerability status
Received
Source identifier
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Published
2026-10-30 21:16:51.170000
Last modified
2026-10-30 21:16:51.170000
View original CVE JSON
{
"id": "CVE-2026-117645",
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"published": "2026-10-30T21:16:51.170",
"lastModified": "2026-10-30T21:16:51.170",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in phoenixframework phoenix_html allows an attacker who controls attribute names to inject attributes and script into rendered HTML via Phoenix.HTML.attributes_escape/1.\n\nattributes_escape/1 in lib/phoenix_html.ex escapes attribute values but not attribute names. key_escape/1 passes a binary key through html_escape, which neutralizes quotes and angle brackets but not whitespace, so a key such as x onmouseover ends the attribute and starts a new one. An atom key is only dasherized, so any character passes, including quotes and >. Nested data, aria and phx keys take the same paths. An application is affected when it builds attribute keys from untrusted input and renders them through HEEx <tag {@attrs}>, content_tag/3, or a direct call. Before 3.0.0 the same code lived in Phoenix.HTML.Tag.\n\nThis issue affects phoenix_html: from 1.0.0 before 3.3.5 and from 4.0.0 before 4.4.0."
}
],
"affected": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"affectedData": [
{
"vendor": "phoenixframework",
"product": "phoenix_html",
"defaultStatus": "unaffected",
"collectionURL": "https://repo.hex.pm",
"packageName": "phoenix_html",
"cpes": [
"cpe:2.3:a:phoenixframework:phoenix_html:*:*:*:*:*:*:*:*"
],
"modules": [
"'Elixir.Phoenix.HTML'",
"'Elixir.Phoenix.HTML.Tag'"
],
"programFiles": [
"lib/phoenix_html.ex",
"lib/phoenix_html/tag.ex"
],
"programRoutines": [
{
"name": "'Elixir.Phoenix.HTML':attributes_escape/1"
},
{
"name": "'Elixir.Phoenix.HTML':build_attrs/1"
},
{
"name": "'Elixir.Phoenix.HTML':nested_attrs/3"
},
{
"name": "'Elixir.Phoenix.HTML':key_escape/1"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':tag/2"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':content_tag/3"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':attributes_escape/1"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':tag_attrs/1"
}
],
"repo": "https://github.com/phoenixframework/phoenix_html",
"packageURL": "pkg:hex/phoenix_html",
"versions": [
{
"version": "1.0.0",
"lessThan": "3.3.5",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.0.0",
"lessThan": "4.4.0",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "phoenixframework",
"product": "phoenix_html",
"defaultStatus": "unaffected",
"collectionURL": "https://github.com",
"packageName": "phoenixframework/phoenix_html",
"cpes": [
"cpe:2.3:a:phoenixframework:phoenix_html:*:*:*:*:*:*:*:*"
],
"modules": [
"'Elixir.Phoenix.HTML'",
"'Elixir.Phoenix.HTML.Tag'"
],
"programFiles": [
"lib/phoenix_html.ex",
"lib/phoenix_html/tag.ex"
],
"programRoutines": [
{
"name": "'Elixir.Phoenix.HTML':attributes_escape/1"
},
{
"name": "'Elixir.Phoenix.HTML':build_attrs/1"
},
{
"name": "'Elixir.Phoenix.HTML':nested_attrs/3"
},
{
"name": "'Elixir.Phoenix.HTML':key_escape/1"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':tag/2"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':content_tag/3"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':attributes_escape/1"
},
{
"name": "'Elixir.Phoenix.HTML.Tag':tag_attrs/1"
}
],
"repo": "https://github.com/phoenixframework/phoenix_html",
"packageURL": "pkg:github/phoenixframework/phoenix_html",
"versions": [
{
"version": "6ad3a1d7960891a468d54636054a98e11dfb5111",
"lessThan": "*",
"versionType": "git",
"status": "affected",
"changes": [
{
"at": "d9e4e6b2d9be49e25fb6d6b4fdbb2008174f01a6",
"status": "unaffected"
},
{
"at": "a47dc8944a773b7e9273d9691dc6744ec793f1de",
"status": "unaffected"
}
]
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "PASSIVE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
]
},
"weaknesses": [
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-79"
}
]
}
],
"references": [
{
"url": "https://cna.erlef.org/cves/CVE-2026-117645.html",
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://github.com/phoenixframework/phoenix_html/commit/6ad3a1d7960891a468d54636054a98e11dfb5111",
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://github.com/phoenixframework/phoenix_html/commit/a47dc8944a773b7e9273d9691dc6744ec793f1de",
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://github.com/phoenixframework/phoenix_html/commit/d9e4e6b2d9be49e25fb6d6b4fdbb2008174f01a6",
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
},
{
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-117645",
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}
]
}