CVE-2026-118177

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{"bugzilla": {"description": "thunderbird: Thunderbird: Credential disclosure via improper calendar location validation", "id": "2562318", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562318"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-73", "details": ["When looking for calendars in a directory on a server, during account setup or when adding a new network calendar, Thunderbird accepted calendar locations pointing to other servers, local files or network shares. A malicious server, or a network attacker when the lookup used plain HTTP, could make Thunderbird subscribe to such a location. On Windows this could leak the user's NTLM credentials to an attacker-controlled host on every calendar refresh, and changes to the calendar could be written to the attacker's share or overwrite a local file. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.", "A flaw was found in Thunderbird. When discovering calendars during account setup or when adding a network calendar, Thunderbird accepts calendar locations pointing to arbitrary remote servers, local files, or network shares. A malicious server or a network attacker intercepting unencrypted traffic can supply an untrusted location and force the application to subscribe to it. This can allow an attacker to obtain the user's NT LAN Manager (NTLM) authentication credentials upon calendar refreshes, or cause local files to be overwritten."], "name": "CVE-2026-118177", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-10-27T18:16:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-118177\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-118177\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=2080924\nhttps://www.mozilla.org/security/advisories/mfsa2026-121/\nhttps://www.mozilla.org/security/advisories/mfsa2026-122/"], "threat_severity": "Moderate"}

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