CVE-2025-10534

HIGH
2025-09-16 [email protected]
8.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

3
Patch Released
Apr 04, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 28, 2026 - 19:12 vuln.today
CVE Published
Sep 16, 2025 - 13:15 nvd
HIGH 8.1

Tags

Mozilla XSS Firefox Thunderbird Redhat Suse

Description

Spoofing issue in the Site Permissions component. This vulnerability affects Firefox < 143 and Thunderbird < 143.

Analysis

Spoofing issue in the Site Permissions component. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical Context

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Spoofing issue in the Site Permissions component. This vulnerability affects Firefox < 143 and Thunderbird < 143. Affected products include: Mozilla Firefox, Mozilla Thunderbird.

Affected Products

Mozilla Firefox, Mozilla Thunderbird.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Priority Score

41
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +40
POC: 0

Vendor Status

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CVE-2025-10534 vulnerability details – vuln.today
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