{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-126133 in the wild and no public exploit code.","exposure":"","fix":"Upgrade to a fixed version.","what":"CVE-2026-126133 is a vulnerability in Mozilla Thunderbird, published on 10 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-126133 and fix it if it is affected.\n\nWhat it is: CVE-2026-126133 is a vulnerability in Mozilla Thunderbird, published on 10 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-126133 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-2026-126133/ (Markdown: https://insights.sbomify.com/CVE-2026-126133/index.md)","id":"CVE-2026-126133","markdown":"https://insights.sbomify.com/CVE-2026-126133/index.md","name":"CVE-2026-126133","record":{"aliases":["DEBIAN-CVE-2026-126133","GHSA-c6f8-6299-g8jq","UBUNTU-CVE-2026-126133"],"analysis":null,"analysis_generated_by":null,"assigner":"mozilla","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"When a CalDAV or ICS calendar was accessed through an HTTP proxy that requested authentication, Thunderbird could answer the proxy with the calendar server's username and password. This affected both setting up a new calendar and syncing existing calendars, where a saved password could be sent without any user interaction. A malicious or compromised proxy could use this to obtain the calendar credentials, even for calendars served over HTTPS. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7.","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":"Calendar server credentials could be sent to an HTTP proxy","id":"CVE-2026-126133","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Feed subscriptions could leak NTLM credentials on Windows","id":"CVE-2026-126134"},"nickname":null,"packages":[],"prev":{"headline":"Attachments could be replaced with local file content when forwarding","id":"CVE-2026-126132"},"products":["Thunderbird"],"published":"2026-11-10","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-11-10","vendors":["Mozilla"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-126133/"}