{"answers":{"affected":"2 open source packages ship an affected version, including roundcube/roundcubemail. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-35539 in the wild and no public exploit code.","fix":"Upgrade roundcube/roundcubemail to 1.7-rc5 or later.","what":"CVE-2026-35539 is a medium-severity cross-site scripting vulnerability in Roundcube Webmail, published on 3 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-2026-35539 and fix it if it is affected.\n\nWhat it is: CVE-2026-35539 is a medium-severity cross-site scripting vulnerability in Roundcube Webmail, published on 3 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: There is no known exploitation of CVE-2026-35539 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- roundcube/roundcubemail (Packagist): affected from 1.7-beta; fixed in 1.7-rc5\n- roundcube/roundcubemail (Packagist): affected from 1.7-beta; fixed in 1.7-rc5\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-2026-35539/ (Markdown: https://insights.sbomify.com/CVE-2026-35539/index.md)","id":"CVE-2026-35539","markdown":"https://insights.sbomify.com/CVE-2026-35539/index.md","name":"CVE-2026-35539","record":{"aliases":["DEBIAN-CVE-2026-35539","GHSA-x4q5-8j5g-hpjc","UBUNTU-CVE-2026-35539"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Roundcube Webmail","requires_auth":"none","summary":"Attackers can execute arbitrary scripts in victim browsers by sending malicious HTML attachments that are improperly sanitized during preview.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"webmail","vendor":"roundcube"}],"cvss":{"score":6.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.","ecosystems":["Packagist"],"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":"Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode","id":"CVE-2026-35539","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"roundcube:webmail","products":["roundcube:webmail"],"type":"xss","year":"2026"},"n_packages":2,"n_references":7,"next":{"headline":"Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages","id":"CVE-2026-35540"},"packages":[{"ecosystem":"Packagist","fixed":["1.7-rc5"],"introduced":["1.7-beta"],"last_affected":[],"package":"roundcube/roundcubemail","purl":null,"source":"GHSA-x4q5-8j5g-hpjc"},{"ecosystem":"Packagist","fixed":["1.7-rc5"],"introduced":["1.7-beta"],"last_affected":[],"package":"roundcube/roundcubemail","purl":"pkg:composer/roundcube/roundcubemail","source":"GHSA-x4q5-8j5g-hpjc"}],"prev":{"headline":"Roundcube Webmail: Unsanitized IMAP SEARCH command arguments","id":"CVE-2026-35538"},"products":["Webmail"],"published":"2026-04-03","related":[{"cvss_score":9.3,"headline":"RoundCube Webmail Cross-Site Scripting","id":"CVE-2024-42009","kev_date_added":"2025-06-09","published":"2024-08-05"},{"cvss_score":7.2,"headline":"RoundCube Webmail Cross-site Scripting","id":"CVE-2025-68461","kev_date_added":"2026-02-20","published":"2025-12-18"},{"cvss_score":10,"headline":"PHPMailer susceptible to arbitrary code execution","id":"CVE-2008-5619","kev_date_added":null,"published":"2008-12-17"},{"cvss_score":9.8,"headline":"Command injection in n/a","id":"CVE-2024-37385","kev_date_added":null,"published":"2024-06-07"},{"cvss_score":9.3,"headline":"Cross-site scripting in n/a","id":"CVE-2024-42008","kev_date_added":null,"published":"2024-08-05"},{"cvss_score":8.8,"headline":"Command injection in Webmail","id":"CVE-2026-74997","kev_date_added":null,"published":"2026-08-17"},{"cvss_score":8.8,"headline":"Privilege escalation in n/a","id":"CVE-2017-8114","kev_date_added":null,"published":"2017-04-29"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"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":"2026-04-03","vendors":["Roundcube"]},"summary":"Attackers can execute arbitrary scripts in victim browsers by sending malicious HTML attachments that are improperly sanitized during preview.","url":"https://insights.sbomify.com/CVE-2026-35539/"}