Bypass of remote UNC path restriction in mailbox: URLs
CVSS score
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EPSS probability
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Risk score
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Published
4 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
CVE-2026-118176 allows bypassing the remote UNC path restriction in mailbox: URLs within Thunderbird on Windows. Displaying a specially crafted email can cause the application to connect to an attacker-chosen SMB server, potentially disclosing user credentials.
This vulnerability can lead to the disclosure of Windows account names and NTLM authentication data, which can be leveraged for offline password cracking or relay attacks.
What should be done?
- Follow the official vendor advisories
- Apply available updates
- Monitor official announcements for affected versions
Chain of evidence and sources
CVE-2026-118176, mailbox: URL'lerindeki uzak UNC yolu kısıtlamasının atlatılmasına izin verir.
Bu güvenlik açığı yalnızca Windows üzerindeki Thunderbird uygulamasını etkiler.
Özel olarak hazırlanmış bir e-posta, kullanıcının Windows hesap adının ve NTLM verilerinin sızmasına yol açabilir.
Show the technical text from the sources
Thunderbird's check that prevents mailbox: URLs from accessing files on remote Windows network shares could be bypassed using extended-length UNC paths. Displaying a specially crafted email could cause Thunderbird to connect to an SMB server chosen by the attacker, disclosing the user's Windows account name and NTLM authentication data, which could be used for offline password cracking or relay attacks. This bug only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-118176 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | mozilla | thunderbird | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-118176 is associated with the following CWEs:
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-2026-118176 weaknesses.
Official Sources and Advisories
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