CVE-2026-55877

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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1	Patch
https://github.com/symfony/ux/releases/tag/v2.36.1	Release Notes
https://github.com/symfony/ux/releases/tag/v3.2.0	Release Notes
https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:symfony:ux::::::::
	cpe:2.3:a:symfony:ux::::::::

History

No history.

Information

Published : 2026-07-08 22:17

Updated : 2026-08-19 19:49

NVD link : CVE-2026-55877

Mitre link : CVE-2026-55877

CVE.ORG link : CVE-2026-55877

JSON object : View

Products Affected

symfony

ux

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2026-55877", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55877", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-09T14:21:00.657899Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "symfony", "product": "ux", "versions": [{"status": "affected", "version": ">= 2.17.0, < 2.36.1"}, {"status": "affected", "version": ">= 3.0.0, < 3.2.0"}]}]}], "published": "2026-07-08T22:17:15.920", "references": [{"url": "https://github.com/symfony/ux/commit/3a4964ec3700f0af4e13f7bfbf8bb3174c3e79d1", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/symfony/ux/releases/tag/v2.36.1", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/symfony/ux/releases/tag/v3.2.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/symfony/ux/security/advisories/GHSA-6v8j-33hc-mv84", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-08-19T19:49:29.010", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2A2604F-B0EF-47BF-AE62-3309CAB25272", "versionEndExcluding": "2.36.1", "versionStartIncluding": "2.17.0"}, {"criteria": "cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B83FC8DB-CA90-4E65-9D50-60F9B591D875", "versionEndExcluding": "3.2.0", "versionStartIncluding": "3.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}