{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-66911 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-66911 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-66911 is a medium-severity vulnerability in Synacor Zimbra Collaboration, published on 29 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-66911 and fix it if it is affected.\n\nWhat it is: CVE-2026-66911 is a medium-severity vulnerability in Synacor Zimbra Collaboration, published on 29 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-66911 in the wild and no public exploit code.\n\nAffected product: Synacor Zimbra Collaboration. 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-2026-66911/ (Markdown: https://insights.sbomify.com/CVE-2026-66911/index.md)","id":"CVE-2026-66911","markdown":"https://insights.sbomify.com/CVE-2026-66911/index.md","name":"CVE-2026-66911","record":{"aliases":["GHSA-4r7g-97vg-fv7w"],"analysis":null,"analysis_generated_by":null,"assigner":"CERT-PL","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Zimbra is vulnerable to stored cross-site scripting (XSS) via the Content-Location MIME header in email attachments. Due to lack of sanitization of the Content-Location header, an attacker can set it to a javascript: URI. An unauthenticated remote attacker can send a crafted email to a victim; when the victim opens the email in the Zimbra web interface and clicks the attachment name, the JavaScript payload executes in the victim's browser context. This issue was fixed in version 10.1.21","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Stored Cross-Site Scripting in Zimbra","id":"CVE-2026-66911","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Stored Cross-Site Scripting in Zimbra","id":"CVE-2026-66912"},"packages":[],"prev":{"headline":"Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage","id":"CVE-2026-66909"},"products":["Zimbra Collaboration"],"published":"2026-10-29","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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-29","vendors":["Synacor"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-66911/"}