{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40873 exists.","fix":"No fix has been published for CVE-2026-40873 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-40873 is a high-severity cross-site scripting vulnerability in mailcow-dockerized, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-40873 and fix it if it is affected.\n\nWhat it is: CVE-2026-40873 is a high-severity cross-site scripting vulnerability in mailcow-dockerized, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40873 exists.\n\nAffected product: mailcow-dockerized. 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-2026-40873/ (Markdown: https://insights.sbomify.com/CVE-2026-40873/index.md)","id":"CVE-2026-40873","markdown":"https://insights.sbomify.com/CVE-2026-40873/index.md","name":"CVE-2026-40873","record":{"aliases":["GHSA-2xjc-rg88-jvpp"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["account_takeover","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"mailcow email suite","requires_auth":"none","summary":"Attackers can execute arbitrary JavaScript in admin browsers via crafted attachment filenames in the quarantine interface, leading to account takeover.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.9,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-80","name":"Improper Neutralization of Script-Related HTML Tags in a Web Page"},{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the Quarantine details modal injects attachment filenames into HTML without escaping, allowing arbitrary HTML/JS execution. An attacker can deliver an email with a crafted attachment name so that when an admin views the quarantine item, JavaScript executes in their browser, taking over their account. Version 2026-03b fixes the vulnerability.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"mailcow: dockerized vulnerable to stored XSS in Quarantine attachment filenames","id":"CVE-2026-40873","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"mailcow: dockerized missing authorization on Forwarding Hosts delete action","id":"CVE-2026-40874"},"packages":[],"prev":{"headline":"mailcow: dockerized vulnerable to stored XSS in autodiscover logs email address field","id":"CVE-2026-40872"},"products":["mailcow-dockerized"],"published":"2026-04-21","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":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-21","vendors":["mailcow"]},"summary":"Attackers can execute arbitrary JavaScript in admin browsers via crafted attachment filenames in the quarantine interface, leading to account takeover.","url":"https://insights.sbomify.com/CVE-2026-40873/"}