CVE-2025-3522
thunderbird: Leak of hashed Window credentials via crafted attachment URL
Severity Score
6.3
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track
*SSVC
Descriptions
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.
This update for MozillaThunderbird fixes the following issues. Mozilla Thunderbird 128.9.2 Leak of hashed Window credentials via crafted attachment URL Information Disclosure of /tmp directory listing User Interface Misrepresentation of attachment URL.
*Credits:
Dario Weißer
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2025-04-11 CVE Reserved
- 2025-04-15 CVE Published
- 2025-04-15 CVE Updated
- 2025-06-22 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
- CWE-1220: Insufficient Granularity of Access Control
CAPEC
References (5)
| URL | Tag | Source |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1955372 | ||
| https://www.mozilla.org/security/advisories/mfsa2025-26 | ||
| https://www.mozilla.org/security/advisories/mfsa2025-27 |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-3522 | 2025-05-13 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2359793 | 2025-05-13 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Mozilla Search vendor "Mozilla" | Thunderbird Search vendor "Mozilla" for product "Thunderbird" | * | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Linux Search vendor "Oracle" for product "Linux" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel Aus Search vendor "Redhat" for product "Rhel Aus" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel E4s Search vendor "Redhat" for product "Rhel E4s" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel Eus Search vendor "Redhat" for product "Rhel Eus" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel Tus Search vendor "Redhat" for product "Rhel Tus" | * | - |
Affected
| ||||||
| Alma Search vendor "Alma" | Linux Search vendor "Alma" for product "Linux" | * | - |
Affected
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| Amazon Search vendor "Amazon" | Linux Search vendor "Amazon" for product "Linux" | * | - |
Affected
| ||||||
| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | * | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | * | - |
Affected
| ||||||
| Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | * | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Linux Search vendor "Oracle" for product "Linux" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel Aus Search vendor "Redhat" for product "Rhel Aus" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel E4s Search vendor "Redhat" for product "Rhel E4s" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel Eus Search vendor "Redhat" for product "Rhel Eus" | * | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Rhel Tus Search vendor "Redhat" for product "Rhel Tus" | * | - |
Affected
| ||||||
| Slackware Search vendor "Slackware" | Slackware Linux Search vendor "Slackware" for product "Slackware Linux" | * | - |
Affected
| ||||||
| Suse Search vendor "Suse" | Packagehub Search vendor "Suse" for product "Packagehub" | * | - |
Affected
| ||||||
| Suse Search vendor "Suse" | Sle-we Search vendor "Suse" for product "Sle-we" | * | - |
Affected
| ||||||
| Suse Search vendor "Suse" | Sled Search vendor "Suse" for product "Sled" | * | - |
Affected
| ||||||
| Suse Search vendor "Suse" | Sles Search vendor "Suse" for product "Sles" | * | - |
Affected
| ||||||
| Suse Search vendor "Suse" | Sles Sap Search vendor "Suse" for product "Sles Sap" | * | - |
Affected
| ||||||