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TI-2026-40330 Aliases CVE-2026-55877GHSA-6v8j-33hc-mv84

Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses

Priority LOW 27CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00338 27th percentileScored 2026-11-07
Fix Fixed ux (symfony): 2.36.1, 3.2.0symfony/ux-icons (Packagist): 2.36.1, 3.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
symfonyux2.17.0 to before 2.36.1; 3.0.0 to before 3.2.02.36.1, 3.2.0Patch availableCNA
—symfony/ux-icons (Packagist)2.17.0 to before 2.36.12.36.1Patch availableGHSA-6v8j-33hc-mv84
—symfony/ux-icons (Packagist)3.0.0 to before 3.2.03.2.0Patch availableGHSA-6v8j-33hc-mv84
  • ux Vendorsymfony Affected 2.17.0 to before 2.36.1; 3.0.0 to before 3.2.0 Fixed in 2.36.1, 3.2.0 Patch available CNA
  • symfony/ux-icons (Packagist) Vendor— Affected 2.17.0 to before 2.36.1 Fixed in 2.36.1 Patch available GHSA-6v8j-33hc-mv84
  • symfony/ux-icons (Packagist) Vendor— Affected 3.0.0 to before 3.2.0 Fixed in 3.2.0 Patch available GHSA-6v8j-33hc-mv84

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*2.17.0 to before 2.36.1; 3.0.0 to before 3.2.0Vulnerablesymfony
  • cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:* Versions 2.17.0 to before 2.36.1; 3.0.0 to before 3.2.0 Vulnerable ·symfony

Remediation

  • Fix · CNA ux (symfony) Fixed in 2.36.1, 3.2.0
  • Fix · GHSA-6v8j-33hc-mv84 symfony/ux-icons (Packagist) Fixed in 2.36.1 Advisory →
  • Fix · GHSA-6v8j-33hc-mv84 symfony/ux-icons (Packagist) Fixed in 3.2.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55877
  2. 2026-10-03 Alias added: GHSA-6v8j-33hc-mv84

References

Patch 1

Advisory 1

Other 4

  • TI-2026-36412 Symfony UX: Information exposure via unescaped LIKE wildcards in EntitySearchUtil CVSS 4.0MEDIUM 6.9
  • TI-2026-36409 Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor CVSS 4.0MEDIUM 6.9
  • TI-2026-36413 Symfony UX: LiveComponentHydrator HMAC checksum lacks component and slot binding CVSS 4.0MEDIUM 6.9
  • TI-2026-36410 Symfony UX: Denial of service in symfony/ux-live-component via unbounded batch action requests CVSS 4.0MEDIUM 5.3
  • TI-2026-36417 Symfony UX: XSS in symfony/ux-autocomplete via unescaped AJAX response data CVSS 4.0MEDIUM 5.1
  • TI-2026-36411 Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag CVSS 4.0LOW 2.3
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences