Universal cross-site scripting (UXSS)

Universal cross-site scripting (UXSS)

Description

Universal cross-site scripting exploits client-side vulnerabilities, either through the browser or the extensions that the user enables, leading to the possibility of cross-side scripting exploitation or the execution of malicious code.

Impact

- Persistently inject malicious JavaScript code. - hijack any session that belongs open in the compromised browser. - Execute malicious code.

Recommendation

Keep your browsers and extensions up to date. Although this is not a definitive solution to the specific vulnerability, always use and install only what is necessary.

Threat

Unauthenticated attacker from the Internet with access to the victim's browser.

Expected Remediation Time

⌚ 600 minutes.

Score

Default score using CVSS 3.1. It may change depending on the context of the src.

Base

  • Attack vector: N
  • Attack complexity: H
  • Privileges required: N
  • User interaction: N
  • Scope: C
  • Confidentiality: H
  • Integrity: L
  • Availability: L

Temporal

  • Exploit code maturity: P
  • Remediation level: U
  • Report confidence: C

Result

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L/E:P/RL:U/RC:C
  • Score:
    • Base: 8.1
    • Temporal: 7.7
  • Severity:
    • Base: High
    • Temporal: High

Score 4.0

Default score using CVSS 4.0. It may change depending on the context of the src.

Base 4.0

  • Attack vector: N
  • Attack complexity: H
  • Attack Requirements: N
  • Privileges required: N
  • User interaction: N
  • Confidentiality (VC): H
  • Integrity (VI): L
  • Availability (VA): L
  • Confidentiality (SC): L
  • Integrity (SI): L
  • Availability (SA): L

Threat 4.0

  • Exploit maturity: P

Result 4.0

  • Vector string: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L/E:P
  • Score:
    • CVSS-BT: 7.0
  • Severity:
    • CVSS-BT: High

Requirements

Fixes

Free trial message
Free trial
Search for vulnerabilities in your apps for free with Fluid Attacks' automated security testing! Start your 21-day free trial and discover the benefits of the Continuous Hacking Essential plan. If you prefer the Advanced plan, which includes the expertise of Fluid Attacks' hacking team, fill out this contact form.