CVE-2026-91130Public exploitNetwork attack vectorHinoki check available

Stored XSS via unescaped chart tooltip labels

Published Sep 22, 2026 · Updated Sep 22, 2026

Stored XSS in Home Assistant Core before 2026.7.0 allows attackers to execute script in a viewer's browser via a crafted entity name. The Statistics Graph card passes the computed entity label into param.seriesName and interpolates it into ECharts tooltip HTML without escaping. Execution requires a default Line chart with an affected field and a viewer hovering over a data point; the script runs in that viewer's Home Assistant origin.

CVSS severity8.8
High
EPSS probability0.39%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Home Assistant Core before 2026.7.0 allows attackers to execute script in a viewer's browser via a crafted entity name. The Statistics Graph card passes the computed entity label into param.seriesName and interpolates it into ECharts tooltip HTML without escaping. Execution requires a default Line chart with an affected field and a viewer hovering over a data point; the script runs in that viewer's Home Assistant origin.

The record

CVE
CVE-2026-91130
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Home Assistant
Product
Home Assistant Core
Classifications
CWE-80, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Home Assistant · Home Assistant Coreversion=< 2026.7.0

Published CVSS scores

8.8Home AssistantCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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