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mccutchen/go-httpbin · Security

Reflected XSS in go-httpbin due to unrestricted client control over Content-Type

GHSA ID
GHSA-528q-4pgm-wvg2
CVE ID
CVE-2025-45286
Severity
low
Published
Updated
CVSS v4
1.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U

Description

Description

The go-httpbin framework is vulnerable to XSS as the user can control the Response Content-Type from GET parameter. This allows attacker to execute cross site scripts in victims browser.

Affected URLs:

  • /response-headers?Content-Type=text/html&xss=%3Cimg/src/onerror=alert(%27xss%27)%3E
  • /base64/PGltZy9zcmMvb25lcnJvcj1hbGVydCgneHNzJyk+?content-type=text/html
  • /base64/decode/PGltZy9zcmMvb25lcnJvcj1hbGVydCgneHNzJyk+?content-type=text/html

Steps to reproduce:

  1. Visit one of the above mentioned URLs.
  2. XSS window will popup

Suggested fix

  • Allow Only Safe Content-Type Values Or give users option to define whitelisted Content-Type headers

Criticality

The following can be major impacts of the issue:

  • Access to victim's sensitive Personal Identifiable Information.
  • Access to CSRF token
  • Cookie injection
  • Phishing
  • And any other thing Javascript can perform

CWEs

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

References

Open GitHub