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TI-2025-20417 Aliases CVE-2025-27608

Self Cross-Site Scripting in Arduino IDE

Priority LOW 6CWE-79Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00203 10th percentileScored 2026-11-07
Fix Fixed arduino-ide (arduino): 2.3.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
arduinoarduino-idebefore 2.3.52.3.5Patch availableCNA
  • arduino-ide Vendorarduino Affected before 2.3.5 Fixed in 2.3.5 Patch available CNA

Remediation

  • Fix · CNA arduino-ide (arduino) Fixed in 2.3.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-27608

References

Other 2

  • TI-2026-35852 ArduinoCore-AVR: Stack-Based Buffer Overflow in String float/double concatenation handler CVSS 4.0MEDIUM 6.9
  • TI-2023-23493 Path traversal in Arduino Create Agent CVSS 3.1HIGH 7.8
  • TI-2023-23491 Insufficient Verification of Data Authenticity in Arduino Create Agent CVSS 3.1HIGH 7.8
  • TI-2026-20963 Arduino App Lab has Improper Data Validation in Internal Terminal Interface CVSS 3.1MEDIUM 6.9
  • TI-2023-23494 Path traversal in Arduino Create Agent CVSS 3.1HIGH 7.1
  • TI-2023-23492 Path traversal in Arduino Create Agent CVSS 3.1HIGH 7.1
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences