{"answers":{"affected":"3 open source packages ship an affected version, including github.com/mattermost/focalboard. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-28736 in the wild and no public exploit code.","fix":"Product is end of life, replace it.","what":"CVE-2026-28736 is a medium-severity missing authorization vulnerability in Mattermost Focalboard, published on 3 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-28736 and fix it if it is affected.\n\nWhat it is: CVE-2026-28736 is a medium-severity missing authorization vulnerability in Mattermost Focalboard, published on 3 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-28736 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/focalboard (Go): affected all versions; no fix listed\n- github.com/mattermost/focalboard (Go): affected all versions up to 7.10.6; no fix listed\n- github.com/mattermost/focalboard (Go): affected all versions up to 7.10.6; no fix listed\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-2026-28736/ (Markdown: https://insights.sbomify.com/CVE-2026-28736/index.md)","id":"CVE-2026-28736","markdown":"https://insights.sbomify.com/CVE-2026-28736/index.md","name":"CVE-2026-28736","record":{"aliases":["GHSA-vph7-r229-qxpf","GO-2026-5670"],"analysis":{"component_type":"web_application","fix_type":"end_of_life","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Focalboard project management","requires_auth":"low_privilege","summary":"An authenticated attacker can read other users' files by guessing file IDs due to missing ownership validation in Focalboard.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mattermost","cpe":[{"product":"focalboard","vendor":"mattermost"}],"cvss":{"score":4.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"}],"description":"** UNSUPPORTED WHEN ASSIGNED ** Focalboard version 8.0 fails to validate file ownership when serving uploaded files. This allows an authenticated attacker who knows a victim's fileID to read the content of the file. NOTE: Focalboard as a standalone product is not maintained and no fix will be issued.","ecosystems":["Go"],"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":"Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)","id":"CVE-2026-28736","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"Gitea 3D file viewer allows stored XSS through glTF extensionsRequired","id":"CVE-2026-28737"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/focalboard","purl":"pkg:golang/github.com/mattermost/focalboard","source":"GO-2026-5670"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["7.10.6"],"package":"github.com/mattermost/focalboard","purl":null,"source":"GHSA-vph7-r229-qxpf"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["7.10.6"],"package":"github.com/mattermost/focalboard","purl":"pkg:golang/github.com/mattermost/focalboard","source":"GHSA-vph7-r229-qxpf"}],"prev":{"headline":"GitHub OAuth Scope Validation","id":"CVE-2026-28735"},"products":["Focalboard"],"published":"2026-04-03","related":[{"cvss_score":8.1,"headline":"Focalboard doesn't sanitize category IDs before incorporating them into dynamic SQL statements","id":"CVE-2026-25773","kev_date_added":null,"published":"2026-04-03"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":["Mattermost"]},"summary":"An authenticated attacker can read other users' files by guessing file IDs due to missing ownership validation in Focalboard.","url":"https://insights.sbomify.com/CVE-2026-28736/"}