VDB-349960 · CVE-2026-3846 · EUVD-2026-10504

Mozilla Firefox up to 148.0.1 CSS Parser cross-domain policy

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$5k-$25k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Mozilla Firefox up to 148.0.1. The affected element is an unknown function of the component CSS Parser. Executing a manipulation can lead to cross-domain policy. This vulnerability is registered as CVE-2026-3846. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Mozilla Firefox up to 148.0.1 and classified as problematic. This vulnerability affects some unknown functionality of the component CSS Parser. The manipulation with an unknown input leads to a cross-domain policy vulnerability. The CWE definition for the vulnerability is CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. As an impact it is known to affect integrity. CVE summarizes:

Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability affects Firefox < 148.0.2.

The advisory is shared for download at bugzilla.mozilla.org. This vulnerability was named CVE-2026-3846 since 03/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 06/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 302204 (Linux Distros Unpatched Vulnerability : CVE-2026-3846), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 148.0.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (302204), EUVD (EUVD-2026-10504) and CERT Bund (WID-SEC-2026-1730). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

Xerox FreeFlow Print Server

Productinfo

Type

Web Browser

Vendor

Mozilla

Name

Firefox

Version

License

open-source

Website

Vendor: https://www.mozilla.org/
Product: https://www.mozilla.org/en-US/firefox/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 6.5
ADP CISA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross-domain policy
CWE: CWE-942 / CWE-346 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 302204
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-3846

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 148.0.2

Timelineinfo

03/09/2026 CVE reserved
03/10/2026 +1 days Advisory disclosed
03/10/2026 +0 days VulDB entry created
06/01/2026 +83 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-3846 (🔒)
GCVE (CVE): GCVE-0-2026-3846
GCVE (VulDB): GCVE-100-349960
EUVD: 🔒
CERT Bund: WID-SEC-2026-1730 - Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 03/10/2026 16:59
Updated: 06/01/2026 07:29
Changes: 03/10/2026 16:59 (55), 03/10/2026 17:58 (2), 03/14/2026 06:29 (2), 03/15/2026 22:00 (12), 06/01/2026 07:29 (7)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.