CVE-2022-31744

Mozilla: CSP bypass enabling stylesheet injection

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An attacker could have injected CSS into stylesheets accessible via internal URIs, such as resource:, and in doing so bypass a page's Content Security Policy. This vulnerability affects Firefox ESR < 91.11, Thunderbird < 102, Thunderbird < 91.11, and Firefox < 101.

Un atacante podría haber inyectado CSS en hojas de estilo accesibles a través de URI internos, como recurso:, y al hacerlo eludir la Política de seguridad de contenido de una página. Esta vulnerabilidad afecta a Firefox ESR < 91.11, Thunderbird < 102, Thunderbird< 91.11 y Firefox < 101.

A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue of an attacker that can inject CSS into stylesheets accessible via internal URIs, such as resources. In doing so, they can bypass a page's Content Security Policy.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-05-26 CVE Reserved
2022-06-19 CVE Published
2024-07-14 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

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

CAPEC

References (5)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2022-20	2023-08-08
https://www.mozilla.org/security/advisories/mfsa2022-25	2023-08-08
https://www.mozilla.org/security/advisories/mfsa2022-26	2023-08-08
https://access.redhat.com/security/cve/CVE-2022-31744	2022-07-01
https://bugzilla.redhat.com/show_bug.cgi?id=2102165	2022-07-01

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"				< 101.0 Search vendor "Mozilla" for product "Firefox" and version " < 101.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 91.11 Search vendor "Mozilla" for product "Firefox Esr" and version " < 91.11"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 91.11 Search vendor "Mozilla" for product "Thunderbird" and version " < 91.11"		-		Affected