CVE-2023-40013

SVG Loader is a javascript library that fetches SVGs using XMLHttpRequests and injects the SVG code in the tag's place. According to the docs, svg-loader will strip all JS code before injecting the SVG file for security reasons but the input sanitization logic is not sufficient and can be trivially bypassed. This allows an attacker to craft a malicious SVG which can result in Cross-site Scripting (XSS). When trying to sanitize the svg the lib removes event attributes such as `onmouseover`, `onclick` but the list of events is not exhaustive. Any website which uses external-svg-loader and allows its users to provide svg src, upload svg files would be susceptible to stored XSS attack. This issue has been addressed in commit `d3562fc08` which is included in releases from 1.6.9. Users are advised to upgrade. There are no known workarounds for this vulnerability.

• CWE-79

• https://github.com/shubhamjain/svg-loader/blob/main/svg-loader.js#L125-L128Product
• https://github.com/shubhamjain/svg-loader/commit/d3562fc08497aec5f33eb82017fa1417b3319e2cPatch
• https://github.com/shubhamjain/svg-loader/security/advisories/GHSA-xc2r-jf2x-gjr8Vendor Advisory
• https://github.com/shubhamjain/svg-loader/tree/main#2-enable-javascriptProduct
• https://github.com/shubhamjain/svg-loader/blob/main/svg-loader.js#L125-L128Product
• https://github.com/shubhamjain/svg-loader/commit/d3562fc08497aec5f33eb82017fa1417b3319e2cPatch
• https://github.com/shubhamjain/svg-loader/security/advisories/GHSA-xc2r-jf2x-gjr8Vendor Advisory
• https://github.com/shubhamjain/svg-loader/tree/main#2-enable-javascriptProduct

Published

Aug 14, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2023-40008Cross-Site Request Forgery (CSRF) vulnerability in Gangesh M…8.8
• CVE-2023-40009Cross-Site Request Forgery (CSRF) vulnerability in ThimPress…6.5
• CVE-2023-4001An authentication bypass flaw was found in GRUB due to the w…6.8
• CVE-2023-40010Improper Neutralization of Special Elements used in an SQL C…9.8
• CVE-2023-40011Missing Authorization vulnerability in StylemixThemes Cost C…5.4
• CVE-2023-40012uthenticode is a small cross-platform library for partially …7.5
• CVE-2023-40014OpenZeppelin Contracts is a library for secure smart contrac…5.3
• CVE-2023-40015Vyper is a Pythonic Smart Contract Language. For the followi…5.3
• CVE-2023-40017GeoNode is an open source platform that facilitates the crea…7.5
• CVE-2023-40018FreeSWITCH is a Software Defined Telecom Stack enabling the …7.5
• CVE-2023-40019FreeSWITCH is a Software Defined Telecom Stack enabling the …6.5
• CVE-2023-4002An issue has been discovered in GitLab EE affecting all vers…6.5