CVE-2026-91130: Home Assistant: XSS in Statistics Graph Card

Should you act?

Critical, preconditions apply

Severe if exploited, but exploitation needs conditions that may not apply to you. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
• EPSS 0.4%, percentile 31: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 31% of all scored CVEs (low). EPSS is a probability, not a verdict.
• Needs an account (low (any account)). Exposure depends on who can log in.
• Only applies if your dependency tree includes homeassistant (PyPI) < 2026.7.0, fixed in 2026.7.0. Check your lockfile, including transitive dependencies.

What it is

Home Assistant is open source home automation software focused on local control and privacy. Prior to 2026.7.0, the Statistics Graph card in src/components/chart/statistics-chart.ts passed entity names through getStatisticLabel and computeStateName and interpolated param.seriesName into ECharts tooltip HTML without escaping. An authenticated user or an integration that supplies a malicious default entity name could cause script-related HTML to execute when a viewer hovered over a data point. Mean, State, Sum, and Change fields in the default Line chart configuration were affected, while Bar charts were not. This issue is fixed in version 2026.7.0.

From the GitHub advisory

Summary An authenticated party can add a malicious name to any statistics-capable entity, allowing for Cross-Site Scripting attacks against anyone who views a Statistics Graph card containing that entity, when they hover over any data point on the chart.

Payload

Payload triggering

An alternative, and more impactful scenario, is that the entity gets a malicious name from the provider of the integration (e.g. Tibber, Shelly, or any HACS integration), and is exploited that way through the default name — without requiring any direct access to the Home Assistant instance. This is the same supply-chain vector as CVE-2025-62172.

Details

Weakness type: CWE-80.

Product: homeassistant (PyPI) · Assigned by: GitHub_M · Published: 2026-09-22

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: low (any account)
• User interaction: active

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation poc, automatable no, technical impact total.
• FIRST EPSS (model of 2026-10-21): 0.39% probability of exploitation activity in the next 30 days; percentile 31.

Timeline

• 2026-09-22 — CVE record last updated
• 2026-09-22 — CVE record published by GitHub_M
• 2026-09-22 — GitHub-reviewed advisory GHSA-wx4m-69m9-gx3m published (critical)

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-wx4m-69m9-gx3m github.com
2. CVE.org record CVE-2026-91130 cve.org
3. NVD entry CVE-2026-91130 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com
2. github.com github.com
3. github.com github.com
4. github.com github.com

Critical PyPI advisories · Today’s Security Digest