Security Vulnerability Report
中文
CVE-2026-6770 CVSS 6.5 MEDIUM

CVE-2026-6770

Published: 2026-04-21 13:16:23
Last Modified: 2026-04-22 15:07:24

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.

CVSS Details

CVSS Score
6.5
Severity
MEDIUM
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Configurations (Affected Products)

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* - VULNERABLE
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* - VULNERABLE
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* - VULNERABLE
Firefox < 150
Firefox ESR < 140.10
Thunderbird < 150
Thunderbird < 140.10

PoC / Exploit Code

⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// PoC Concept for IndexedDB Information Leak // This script attempts to open a database and read potentially sensitive data // to demonstrate the access control issue in IndexedDB. const dbName = "target_db"; const request = indexedDB.open(dbName, 1); request.onerror = function(event) { console.log("[PoC] Database error: " + event.target.errorCode); }; request.onsuccess = function(event) { const db = event.target.result; console.log("[PoC] Database opened successfully"); // Attempt to read data from an object store const transaction = db.transaction(["sensitive_data"], "readwrite"); const objectStore = transaction.objectStore("sensitive_data"); const objectRequest = objectStore.getAll(); objectRequest.onsuccess = function(event) { console.log("[PoC] Data leaked: " + JSON.stringify(event.target.result)); }; }; // Trigger the vulnerability logic console.log("[PoC] Checking IndexedDB access patterns...");

References

Raw JSON Data

JSON
{"cve": {"id": "CVE-2026-6770", "sourceIdentifier": "[email protected]", "published": "2026-04-21T13:16:22.840", "lastModified": "2026-04-22T15:07:23.650", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 2.5}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "versionEndExcluding": "140.10.0", "matchCriteriaId": "15AF037C-5C86-48EB-B1DE-3AC100A34596"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "versionEndExcluding": "150.0", "matchCriteriaId": "67B01D49-66FA-4C76-9EB4-2B8CD61FBEB2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "versionEndExcluding": "140.10.0", "matchCriteriaId": "41C982A2-D35E-4B90-A85E-CD02EDC6DEE9"}]}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2024220", "source": "[email protected]", "tags": ["Permissions Required"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-30/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-32/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-33/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-34/", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}