// For flags

CVE-2021-23986

 

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87.

Una extensión maliciosa con el permiso de "search" podría haber instalado un nuevo motor de búsqueda cuyo favicon hiciera referencia a una URL de origen cruzado.&#xa0;La respuesta a esta petición de origen cruzado podría haber sido leída por la extensión, permitiendo a la extensión omitir la política del mismo origen, que no debería tener permisos de origen cruzado.&#xa0;Esta petición de origen cruzado fue hecha sin cookies, por lo que la información confidencial divulgada por la infracción se limitó a los recursos de la red local o los recursos que llevan a cabo la autenticación basada en IP.&#xa0;Esta vulnerabilidad afecta a Firefox versiones anteriores a 87.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-01-13 CVE Reserved
  • 2021-03-26 CVE Published
  • 2023-12-15 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-346: Origin Validation Error
CAPEC
References (1)
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Mozilla
Search vendor "Mozilla"
Firefox
Search vendor "Mozilla" for product "Firefox"
< 87.0
Search vendor "Mozilla" for product "Firefox" and version " < 87.0"
-
Affected