{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-113866 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-113866 is a medium-severity vulnerability in Mozilla Thunderbird, published on 20 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-113866 and fix it if it is affected.\n\nWhat it is: CVE-2026-113866 is a medium-severity vulnerability in Mozilla Thunderbird, published on 20 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-113866 in the wild and no public exploit code.\n\nAffected product: Mozilla Thunderbird. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-113866/ (Markdown: https://insights.sbomify.com/CVE-2026-113866/index.md)","id":"CVE-2026-113866","markdown":"https://insights.sbomify.com/CVE-2026-113866/index.md","name":"CVE-2026-113866","record":{"aliases":["DEBIAN-CVE-2026-113866","GHSA-6c7w-fhrm-qhj3","UBUNTU-CVE-2026-113866"],"analysis":null,"analysis_generated_by":null,"assigner":"mozilla","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-523","name":"Unprotected Transport of Credentials"}],"description":"When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Account password sent unencrypted during Exchange account setup","id":"CVE-2026-113866","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Stanza injection in XMPP chat","id":"CVE-2026-113867"},"packages":[],"prev":{"headline":"PayPlug for WooCommerce 2.8.0 - 3.1.0 - Unauthenticated Arbitrary Order Deletion, Modification and Disclosure","id":"CVE-2026-113813"},"products":["Thunderbird"],"published":"2026-10-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-20","vendors":["Mozilla"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-113866/"}