Answer in brief
CVE-2026-117645 records a Medium severity (CVSS 5.3) vulnerability in Phoenix.HTML vulnerable to attribute injection via unvalidated attribute names in attributes_escape/1. The current sources do not mark it as known exploited. The current feed maps phoenixframework/phoenixframework/phoenix_html (generic), phoenixframework/phoenix_html (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps phoenixframework/phoenixframework/phoenix_html (generic), phoenixframework/phoenix_html (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| phoenixframework/phoenixframework/phoenix_htmlgeneric | >=6ad3a1d7960891a468d54636054a98e11dfb5111 <* | * |
| phoenixframework/phoenix_htmlgeneric | >=1.0.0 <3.3.5 || >=4.0.0 <4.4.0 | 3.3.5, 4.4.0 |
Published upstream
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 30, 2026
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.
Quoted source text, attributed separately from HOL analysis.