Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-55877— Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses

CVSS 6.1 · Medium EPSS 0.19% · P9

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProductVersion RangeStatus
symfonyux>= 2.17.0, < 2.36.1affected
>= 3.0.0, < 3.2.0affected
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-55877

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Symfony UX: XSS in symfony/ux-icons via unsanitized SVG content in local files and Iconify on-demand responses
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Symfony UX 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Symfony ux是Symfony组织开源的一个Symfony的JavaScript生态系统。 Symfony UX存在跨站脚本漏洞，该漏洞源于ux_icon() Twig函数被标记为 is_safe=['html'] 且 Icon::toHtml() 直接内联SVG源代码，导致未清理的本地SVG文件或Iconify按需JSON正文响应中包含嵌套脚本元素、on*事件处理程序或危险URL方案，容易受到跨站脚本攻击。以下版本受到影响：2.17.0版本至2.36.1之前版本和3.0.0版本至3.2.0之前版本
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
symfonyux >= 2.17.0, < 2.36.1 -

II. Public POCs for CVE-2026-55877

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-55877

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-55877 (1)

Vendor Pages for CVE-2026-55877 (2)

IV. Related Vulnerabilities

Same product: ux
Same vendor: symfony
Same weakness: CWE-79

V. Comments for CVE-2026-55877

No comments yet

Leave a comment