--- title: "CVE-2026-73546: Envoy - Stored XSS" description: "Envoy < 1.36.10, 1.37.6, 1.38.4, and 1.39.1 contains a stored XSS caused by unencoded statistic names in /stats?format=html admin endpoint, letting attackers execute scripts in admin interface, exploit requires browser-accessible admin interface and enabled component persisting attacker data." url: https://panop.io/threat-heartbeat/CVE-2026-73546/ --- # CVE-2026-73546 Envoy - Stored XSS Envoy < 1.36.10, 1.37.6, 1.38.4, and 1.39.1 contains a stored XSS caused by unencoded statistic names in /stats?format=html admin endpoint, letting attackers execute scripts in admin interface, exploit requires browser-accessible admin interface and enabled component persisting attacker data. CVSS base score 7.4 /10 High CISA KEV Not listed Public exploit Proof of concept available Authentication Not required EPSS 0.62% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-73546) ## Details Type Stored XSS Impact Client Script Exec CVSS vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Published 21 September 2026 Updated 15 October 2026 Weakness [CWE-79](https://cwe.mitre.org/data/definitions/79.html) ## Vendor fix Update to versions 1.36.10, 1.37.6, 1.38.4, or 1.39.1 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-73546](https://nvd.nist.gov/vuln/detail/CVE-2026-73546) - [https://github.com/envoyproxy/envoy/releases/tag/v1.36.10](https://github.com/envoyproxy/envoy/releases/tag/v1.36.10) - [https://github.com/envoyproxy/envoy/releases/tag/v1.39.1](https://github.com/envoyproxy/envoy/releases/tag/v1.39.1) - [https://github.com/envoyproxy/envoy/commit/884d30c56b835d5801733ae1dc38c94a08de23e8](https://github.com/envoyproxy/envoy/commit/884d30c56b835d5801733ae1dc38c94a08de23e8) - [https://github.com/envoyproxy/envoy/commit/ab63a0e52b5a28472f2ff865b6464ae4004f7593](https://github.com/envoyproxy/envoy/commit/ab63a0e52b5a28472f2ff865b6464ae4004f7593) - [https://github.com/envoyproxy/envoy/releases/tag/v1.37.6](https://github.com/envoyproxy/envoy/releases/tag/v1.37.6) - [https://github.com/envoyproxy/envoy/releases/tag/v1.38.4](https://github.com/envoyproxy/envoy/releases/tag/v1.38.4) - [https://github.com/envoyproxy/envoy/security/advisories/GHSA-pv9h-4fxf-7vrg](https://github.com/envoyproxy/envoy/security/advisories/GHSA-pv9h-4fxf-7vrg) - [https://github.com/envoyproxy/envoy/commit/11d34660ca0322eb125d045a564d9d87f016397f](https://github.com/envoyproxy/envoy/commit/11d34660ca0322eb125d045a564d9d87f016397f) - [https://github.com/envoyproxy/envoy/commit/9484e17c34353662f9bfd30c74f61fa8c9ee7b83](https://github.com/envoyproxy/envoy/commit/9484e17c34353662f9bfd30c74f61fa8c9ee7b83) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)