Answer in brief
CVE-2026-45753 records a Medium severity (CVSS 6.1) vulnerability in Symfony: HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — javascript: URI Survives Sanitization (XSS). The current sources do not mark it as known exploited. The current feed maps symfony/html-sanitizer (generic), symfony/symfony (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-45753 records a Medium severity (CVSS 6.1) vulnerability in Symfony: HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — javascript: URI Survives Sanitization (XSS). The current sources do not mark it as known exploited. The current feed maps symfony/html-sanitizer (generic), symfony/symfony (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 6.1. 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 symfony/html-sanitizer (generic), symfony/symfony (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| symfony/html-sanitizergeneric | >= 6.1.0-BETA1, < 6.4.40 || >= 7.0.0-BETA1, < 7.4.12 || >= 8.0.0-BETA1, < 8.0.12 | Not reported |
| symfony/symfonygeneric | >= 6.1.0-BETA1, < 6.4.40 || >= 7.0.0-BETA1, < 7.4.12 || >= 8.0.0-BETA1, < 8.0.12 | Not reported |
Published upstream
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlAttributeSanitizer::getSupportedAttributes() omits URL-valued attributes including action, formaction, poster, and cite, so configurations that admit those attributes can leave javascript: URIs unsanitized and enable XSS when the resulting HTML is rendered or a victim submits a form or clicks a button. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
Quoted source text, attributed separately from HOL analysis.
CVSS is 6.1. 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 symfony/html-sanitizer (generic), symfony/symfony (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| symfony/html-sanitizergeneric | >= 6.1.0-BETA1, < 6.4.40 || >= 7.0.0-BETA1, < 7.4.12 || >= 8.0.0-BETA1, < 8.0.12 | Not reported |
| symfony/symfonygeneric | >= 6.1.0-BETA1, < 6.4.40 || >= 7.0.0-BETA1, < 7.4.12 || >= 8.0.0-BETA1, < 8.0.12 | Not reported |
Published upstream
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlAttributeSanitizer::getSupportedAttributes() omits URL-valued attributes including action, formaction, poster, and cite, so configurations that admit those attributes can leave javascript: URIs unsanitized and enable XSS when the resulting HTML is rendered or a victim submits a form or clicks a button. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
Quoted source text, attributed separately from HOL analysis.