SB2026111215 - Cross-site scripting in Gatsby

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Main Vulnerability Database SB2026111215

SB2026111215 - Cross-site scripting in Gatsby

Published: November 12, 2026

Security Bulletin ID SB2026111215
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Cross-site scripting (CVE-ID: N/A)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 2 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]


The vulnerability allows a remote attacker on the local network to execute arbitrary JavaScript in a victim's browser through reflected cross-site scripting.

The vulnerability exists due to missing content-type specification in Gatsby's development server /_gatsby/file endpoint when proxying attacker-controlled responses, allowing browser content sniffing to interpret HTML as a web page. A remote attacker on the local network can trick a victim into opening a crafted URL using the u query parameter to proxy malicious HTML through a development server exposed to an untrusted network.


Remediation

Install update from vendor's website.

References