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CVE-2024-27287

ESPHome vulnerable to stored Cross-site Scripting in edit configuration file API

HIGH
8.7
CVSS Score
Published: March 6, 2024 at 06:19 PM UTC
Updated: June 17, 2026 at 07:19 AM UTC
1 product affected across 1 vendorEsphome

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Severity
HIGH8.7
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

ESPHome is a system to control your ESP8266/ESP32 for Home Automation systems. Starting in version 2023.12.9 and prior to version 2024.2.2, editing the configuration file API in dashboard component of ESPHome version 2023.12.9 (command line installation and Home Assistant add-on) serves unsanitized data with `Content-Type: text/html; charset=UTF-8`, allowing a remote authenticated user to inject arbitrary web script and exfiltrate session cookies via Cross-Site scripting. It is possible for a malicious authenticated user to inject arbitrary Javascript in configuration files using a POST request to the /edit endpoint, the configuration parameter allows to specify the file to write. To trigger the XSS vulnerability, the victim must visit the page` /edit?configuration=[xss file]`. Abusing this vulnerability a malicious actor could perform operations on the dashboard on the behalf of a logged user, access sensitive information, create, edit and delete configuration files and flash firmware on managed boards. In addition to this, cookies are not correctly secured, allowing the exfiltration of session cookie values. Version 2024.2.2 contains a patch for this issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Esphome· Esphome
95%
v < 2024.2.22023.12.9 ≤ v < 2024.2.22023.12.9
Affected range stops below 2024.2.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/esphome/esphome/commit/37d2b3c7977a4ccbec59726ca7549cb776661455
x_refsource_CONFIRMTechnical DescriptionVendor Advisory
Source: [email protected]
https://github.com/esphome/esphome/security/advisories/GHSA-9p43-hj5j-96h5

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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