CVE-2026-6770

6.5

MEDIUM CVSS 3.1

Other issue in the Storage: IndexedDB component

Overview

Description

Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Details

INFO

Published Date :

April 21, 2026, 1:16 p.m.

Last Modified :

April 22, 2026, 3:07 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-6770 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Mozilla	firefox
2	Mozilla	thunderbird

: Total Affected Vendor : 1 | Products : 2

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	MEDIUM				134c704f-9b21-4f2e-91b3-4a467353bcc0

Solution

Update the application to the latest version to fix the IndexedDB vulnerability.

Update to Firefox 150 or later.
Update to Firefox ESR 140.10 or later.

Public PoC/Exploit Available at Github

CVE-2026-6770 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-6770.

URL	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2024220	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-30/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-32/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-33/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-34/	Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-6770 is associated with the following CWEs:

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-6770 weaknesses.

CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-116: Excavation Excavation CAPEC-169: Footprinting Footprinting CAPEC-224: Fingerprinting Fingerprinting CAPEC-285: ICMP Echo Request Ping ICMP Echo Request Ping CAPEC-287: TCP SYN Scan TCP SYN Scan CAPEC-290: Enumerate Mail Exchange (MX) Records Enumerate Mail Exchange (MX) Records CAPEC-291: DNS Zone Transfers DNS Zone Transfers CAPEC-292: Host Discovery Host Discovery CAPEC-293: Traceroute Route Enumeration Traceroute Route Enumeration CAPEC-294: ICMP Address Mask Request ICMP Address Mask Request CAPEC-295: Timestamp Request Timestamp Request CAPEC-296: ICMP Information Request ICMP Information Request CAPEC-297: TCP ACK Ping TCP ACK Ping CAPEC-298: UDP Ping UDP Ping CAPEC-299: TCP SYN Ping TCP SYN Ping CAPEC-300: Port Scanning Port Scanning CAPEC-301: TCP Connect Scan TCP Connect Scan CAPEC-302: TCP FIN Scan TCP FIN Scan CAPEC-303: TCP Xmas Scan TCP Xmas Scan CAPEC-304: TCP Null Scan TCP Null Scan CAPEC-305: TCP ACK Scan TCP ACK Scan CAPEC-306: TCP Window Scan TCP Window Scan CAPEC-307: TCP RPC Scan TCP RPC Scan CAPEC-308: UDP Scan UDP Scan CAPEC-309: Network Topology Mapping Network Topology Mapping CAPEC-310: Scanning for Vulnerable Software Scanning for Vulnerable Software CAPEC-312: Active OS Fingerprinting Active OS Fingerprinting CAPEC-313: Passive OS Fingerprinting Passive OS Fingerprinting CAPEC-317: IP ID Sequencing Probe IP ID Sequencing Probe CAPEC-318: IP 'ID' Echoed Byte-Order Probe IP 'ID' Echoed Byte-Order Probe CAPEC-319: IP (DF) 'Don't Fragment Bit' Echoing Probe IP (DF) 'Don't Fragment Bit' Echoing Probe CAPEC-320: TCP Timestamp Probe TCP Timestamp Probe CAPEC-321: TCP Sequence Number Probe TCP Sequence Number Probe CAPEC-322: TCP (ISN) Greatest Common Divisor Probe TCP (ISN) Greatest Common Divisor Probe CAPEC-323: TCP (ISN) Counter Rate Probe TCP (ISN) Counter Rate Probe CAPEC-324: TCP (ISN) Sequence Predictability Probe TCP (ISN) Sequence Predictability Probe CAPEC-325: TCP Congestion Control Flag (ECN) Probe TCP Congestion Control Flag (ECN) Probe CAPEC-326: TCP Initial Window Size Probe TCP Initial Window Size Probe CAPEC-327: TCP Options Probe TCP Options Probe CAPEC-328: TCP 'RST' Flag Checksum Probe TCP 'RST' Flag Checksum Probe CAPEC-329: ICMP Error Message Quoting Probe ICMP Error Message Quoting Probe CAPEC-330: ICMP Error Message Echoing Integrity Probe ICMP Error Message Echoing Integrity Probe CAPEC-472: Browser Fingerprinting Browser Fingerprinting CAPEC-497: File Discovery File Discovery CAPEC-508: Shoulder Surfing Shoulder Surfing CAPEC-573: Process Footprinting Process Footprinting CAPEC-574: Services Footprinting Services Footprinting CAPEC-575: Account Footprinting Account Footprinting CAPEC-576: Group Permission Footprinting Group Permission Footprinting CAPEC-577: Owner Footprinting Owner Footprinting CAPEC-616: Establish Rogue Location Establish Rogue Location CAPEC-643: Identify Shared Files/Directories on System Identify Shared Files/Directories on System CAPEC-646: Peripheral Footprinting Peripheral Footprinting CAPEC-651: Eavesdropping Eavesdropping

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

nightcorefan94/CVE-2026-6770

CVE-2026-6770 PoC for Firefox/Tor

HTML

Updated: 2 weeks ago

0 stars 0 fork 0 watcher

Born at : April 28, 2026, 10:12 p.m. This repo has been linked 1 different CVEs too.

w4zu/Debian_security

DSA and DLA for Debian last 14 days

Python

Updated: 2 weeks, 4 days ago

0 stars 0 fork 0 watcher

Born at : Feb. 12, 2025, 2:08 p.m. This repo has been linked 116 different CVEs too.

ScottyxNova/QMasters-TIA

None

PowerShell Shell

Updated: 2 weeks ago

1 stars 0 fork 0 watcher

Born at : Dec. 30, 2024, 12:41 p.m. This repo has been linked 5 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-6770 vulnerability anywhere in the article.

security.nl

Firefox-bug maakt cross-site tracking en Tor-fingerprinting mogelijk

Mozilla heeft een kwetsbaarheid in Firefox gedicht waardoor het mogelijk was om gebruikers te fingerprinten. Het beveiligingslek, aangeduid als CVE-2026-6770, bevond zich in IndexedDB. De kwetsbaarhei ...

Published Date: Apr 28, 2026 (2 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-6770 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

Apr. 22, 2026

Action	Type	New Value
Added	CPE Configuration	OR cpe:2.3:a:mozilla:firefox:::::-::: versions up to (excluding) 150.0 cpe:2.3:a:mozilla:firefox:::::esr::: versions up to (excluding) 140.10.0 cpe:2.3:a:mozilla:thunderbird::::::::* versions up to (excluding) 140.10.0
Added	Reference Type	Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=2024220 Types: Permissions Required
Added	Reference Type	Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-30/ Types: Vendor Advisory
Added	Reference Type	Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-32/ Types: Vendor Advisory
Added	Reference Type	Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-33/ Types: Vendor Advisory
Added	Reference Type	Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-34/ Types: Vendor Advisory

CVE Modified by [email protected]