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Open Redirect CVE-2025-3522

MEDIUM
URL Redirection to Untrusted Site (Open Redirect) (CWE-601)
2025-04-15 security@mozilla.org
Microsoft Open Redirect Google Mozilla Chrome
6.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
SUSE
MEDIUM
qualitative
Red Hat
7.4 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

3
Patch released
Apr 06, 2026 - 02:30 nvd
Patch available
Analysis Generated
Mar 28, 2026 - 18:36 vuln.today
CVE Published
Apr 15, 2025 - 15:16 nvd
MEDIUM 6.3

DescriptionCVE.org

Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.

AnalysisAI

Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. Rated medium severity (CVSS 6.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Open Redirect (CWE-601), which allows attackers to redirect users to malicious websites via URL manipulation. Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2. Affected products include: Mozilla Thunderbird.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate redirect destinations against an allowlist, avoid using user input in redirect URLs.

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Same weakness CWE-601 – URL Redirection to Untrusted Site (Open Redirect)

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP6 SUSE Linux Enterprise Server 15 SP6 SUSE Linux Enterprise Server for SAP Applications 15 SP6 SUSE Linux Enterprise Workstation Extension 15 SP6 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6 Fixed
openSUSE Leap 15.6 Fixed

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CVE-2025-3522 vulnerability details – vuln.today
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