Mozilla Firefox up to 82.x on Android File Download information disclosure

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 (≈)
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 82.x on Android. It has been classified as problematic. Affected by this issue is some unknown functionality of the component File Download Handler. This manipulation causes information disclosure. This vulnerability appears as CVE-2020-26955. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Mozilla Firefox up to 82.x on Android (Web Browser) and classified as problematic. Affected by this vulnerability is an unknown code block of the component File Download Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality.

The weakness was presented 12/09/2020 as mfsa2020-50. The advisory is shared at mozilla.org. This vulnerability is known as CVE-2020-26955. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 83.0 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0337). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Open Source CentOS
  • Debian Linux
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • Gentoo Linux
  • Open Source Arch Linux
  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox 83.0

Timelineinfo

10/12/2020 🔍
12/09/2020 +58 days 🔍
12/09/2020 +0 days 🔍
02/09/2026 +1888 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: mfsa2020-50
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2020-26955 (🔍)
GCVE (CVE): GCVE-0-2020-26955
GCVE (VulDB): GCVE-100-165793
CERT Bund: WID-SEC-2026-0337 - Mozilla Firefox und Thunderbird: Mehrere Schwachstellen

scip Labs: https://www.scip.ch/en/?labs.20130704

Entryinfo

Created: 12/09/2020 10:43
Updated: 02/09/2026 10:28
Changes: 12/09/2020 10:43 (43), 12/14/2020 08:14 (6), 12/14/2020 08:18 (18), 02/09/2026 10:28 (22)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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