Answer in brief
CVE-2026-55877 records a Medium severity (CVSS 6.1) vulnerability in Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses. The current sources do not mark it as known exploited. The current feed maps symfony/ux-icons (composer), symfony/ux-icons (composer), symfony/ux (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-2026-55877 records a Medium severity (CVSS 6.1) vulnerability in Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses. The current sources do not mark it as known exploited. The current feed maps symfony/ux-icons (composer), symfony/ux-icons (composer), symfony/ux (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/ux-icons (composer), symfony/ux-icons (composer), symfony/ux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| symfony/ux-iconscomposer | >=2.17.0,<2.36.1 | 2.36.1 |
| symfony/ux-iconscomposer | >=3.0.0,<3.2.0 | 3.2.0 |
| symfony/uxgeneric | >= 2.17.0, < 2.36.1 || >= 3.0.0, < 3.2.0 | Not reported |
Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux_icon() Twig function is marked is_safe=['html'] and Icon::toHtml() inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing nested script elements, on* event handlers, or dangerous URL schemes to execute cross-site scripting. This issue is fixed in versions 2.36.1 and 3.2.0.
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/ux-icons (composer), symfony/ux-icons (composer), symfony/ux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| symfony/ux-iconscomposer | >=2.17.0,<2.36.1 | 2.36.1 |
| symfony/ux-iconscomposer | >=3.0.0,<3.2.0 | 3.2.0 |
| symfony/uxgeneric | >= 2.17.0, < 2.36.1 || >= 3.0.0, < 3.2.0 | Not reported |
Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
Symfony UX is a JavaScript ecosystem for Symfony. From 2.17.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux_icon() Twig function is marked is_safe=['html'] and Icon::toHtml() inlines SVG source verbatim, allowing unsanitized local SVG files or Iconify on-demand JSON body responses containing nested script elements, on* event handlers, or dangerous URL schemes to execute cross-site scripting. This issue is fixed in versions 2.36.1 and 3.2.0.
Quoted source text, attributed separately from HOL analysis.