What’s Vulnerable › Vulnerabilities

CVE-2025-2830: Information Disclosure of /tmp directory listing

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-15 · updated 2026-06-17
• Weakness: CWE-22

Description

By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disclose sensitive information from the victim's system. This vulnerability is not limited to Linux; similar behavior has been observed on Windows as well. This vulnerability was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.

Affected products

• Mozilla Thunderbird: before 128.9.2; from 129.0 before 137.0.2 — fixed in 128.9.2, 137.0.2

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 128.9.2, 137.0.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1956379
• https://www.mozilla.org/security/advisories/mfsa2025-26/
• https://www.mozilla.org/security/advisories/mfsa2025-27/

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