Envoy: Stored XSS in Admin Stats Interface (/stats?format=html)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73546
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-21 20:17:28 UTC
Updated2026-09-21 21:17:09 UTC
DescriptionEnvoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's /stats?format=html admin endpoint uses StatsHtmlRender, which sanitizes string statistic values but emits statistic names without HTML encoding. A data-plane component such as grpc_stats with stats_for_all_methods enabled can incorporate attacker-controlled path segments into cached dynamic statistic names. When an operator views the HTML stats page, the stored name can execute script with the admin interface's origin and issue privileged same-origin requests. The relevant scope boundary is that the admin interface must be browser-accessible and an enabled component must persist attacker-influenced text in statistic names. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Envoyproxy Envoy affected < 1.36.10 Not specified
CNA Envoyproxy Envoy affected >= 1.37.0, < 1.37.6 Not specified
CNA Envoyproxy Envoy affected >= 1.38.0, < 1.38.4 Not specified
CNA Envoyproxy Envoy affected >= 1.39.0, < 1.39.1 Not specified

References

ReferenceSourceLinkTags
github.com/envoyproxy/envoy/commit/ab63a0e52b5a28472f2ff865b6464ae4004f7593 [email protected] github.com
github.com/envoyproxy/envoy/commit/11d34660ca0322eb125d045a564d9d87f016397f [email protected] github.com
github.com/envoyproxy/envoy/commit/884d30c56b835d5801733ae1dc38c94a08de23e8 [email protected] github.com
github.com/envoyproxy/envoy/releases/tag/v1.37.6 [email protected] github.com
github.com/envoyproxy/envoy/releases/tag/v1.39.1 [email protected] github.com
github.com/envoyproxy/envoy/releases/tag/v1.36.10 [email protected] github.com
github.com/envoyproxy/envoy/commit/9484e17c34353662f9bfd30c74f61fa8c9ee7b83 [email protected] github.com
github.com/envoyproxy/envoy/security/advisories/GHSA-pv9h-4fxf-7vrg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/envoyproxy/envoy/releases/tag/v1.38.4 [email protected] github.com
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