VDB-152239 · CVE-2020-6802 · GHSA-q65m-pv3f-wr5r

Mozilla Bleach up to 3.10 cross site scripting

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Mozilla Bleach up to 3.10 and classified as problematic. Affected is an unknown function. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2020-6802. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Mozilla Bleach up to 3.10 (Web Browser) and classified as problematic. Affected by this vulnerability is an unknown part. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

In Mozilla Bleach before 3.11, a mutation XSS affects users calling bleach.clean with noscript and a raw tag in the allowed/whitelisted tags option.

The weakness was shared 03/24/2020. This vulnerability is known as CVE-2020-6802 since 01/10/2020. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 301534 (Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Bleach vulnerabilities (USN-8077-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.11 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (301534). The entry VDB-152240 is related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Web Browser

Vendor

Mozilla

Name

Bleach

Version

License

open-source

Website

Vendor: https://www.mozilla.org/
Product: https://github.com/mozilla/bleach/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

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

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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
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Nessus ID: 301534
Nessus Name: Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Bleach vulnerabilities (USN-8077-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Bleach 3.11

Timelineinfo

01/10/2020 🔍
03/24/2020 +74 days 🔍
03/25/2020 +1 days 🔍
03/10/2026 +2176 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: github.com

Advisory: GHSA-q65m-pv3f-wr5r
Status: Confirmed

CVE: CVE-2020-6802 (🔍)
GCVE (CVE): GCVE-0-2020-6802
GCVE (VulDB): GCVE-100-152239
See also: 🔍

Entryinfo

Created: 03/25/2020 11:04
Updated: 03/10/2026 11:55
Changes: 03/25/2020 11:04 (37), 03/25/2020 11:09 (18), 05/11/2024 11:36 (19), 05/11/2024 11:43 (2), 05/10/2025 13:18 (5), 03/10/2026 11:55 (2)
Complete: 🔍
Cache ID: 216::103