CVE-2026-45323: MeshCore Card: XSS vulnerability through meshcore node name

Severity: critical (CVSS 9.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-28 · updated 2026-10-26
Weakness: CWE-79

Description

MeshCore Card provides MeshCore Lovelace card for Home Assistant. Prior to 0.3.3, Meshcore node names are rendered without HTML escaping in meshcore-card, allowing any node within direct or indirect (repeated) radio range to execute arbitrary javascript in the Home Assistant frontend of anyone viewing the card. This vulnerability is fixed in 0.3.3.

Affected products

jpettitt meshcore-card: before 0.3.3 — fixed in 0.3.3

How to fix

Upgrade to a fixed version: jpettitt meshcore-card 0.3.3. Check the vendor advisory for mitigations.

References

https://github.com/jpettitt/meshcore-card/security/advisories/GHSA-5vrg-xpcj-xppc
https://github.com/jpettitt/meshcore-card/security/advisories/GHSA-5vrg-xpcj-xppc

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