{"answers":{"affected":"16 open source packages ship an affected version, including github.com/mattermost/mattermost-server, github.com/mattermost/mattermost and github.com/mattermost/mattermost-server/v5. It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-11776 in the wild and no public exploit code.","fix":"Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20250815165020-c8d66301415d or later.","what":"CVE-2025-11776 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 14 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-11776 and fix it if it is affected.\n\nWhat it is: CVE-2025-11776 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 14 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-11776 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/mattermost-server (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost-server (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\n- github.com/mattermost/mattermost-server (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\n- github.com/mattermost/mattermost (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\n- github.com/mattermost/mattermost (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\n- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\n- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; fixed in 5.3.2-0.20250815165020-c8d66301415d\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-2025-11776/ (Markdown: https://insights.sbomify.com/CVE-2025-11776/index.md)","id":"CVE-2025-11776","markdown":"https://insights.sbomify.com/CVE-2025-11776/index.md","name":"CVE-2025-11776","record":{"aliases":["GHSA-j6gg-r5jc-47cm","GO-2025-4126","MINI-59fr-w6rm-38g7"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Mattermost chat platform","requires_auth":"low_privilege","summary":"Guest users can discover archived public channels due to improper access control in the search API, exposing channel metadata.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mattermost","cpe":[{"product":"mattermost_server","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-863","name":"Incorrect Authorization"}],"description":"Mattermost versions \u003c11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint","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":"Guest user can discover archived public channels","id":"CVE-2025-11776","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"mattermost:mattermost_server","products":["mattermost:mattermost_server"],"type":"missing_authorization","year":"2025"},"n_packages":16,"n_references":1,"next":{"headline":"Cross-team channel membership access","id":"CVE-2025-11777"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost","purl":"pkg:golang/github.com/mattermost/mattermost","source":"GO-2025-4126"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost","purl":null,"source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost","purl":"pkg:golang/github.com/mattermost/mattermost","source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GO-2025-4126"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","source":"GO-2025-4126"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v5","purl":null,"source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","source":"GO-2025-4126"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v6","purl":null,"source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":["5.3.2-0.20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":["8.0.0-20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":null,"source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":["8.0.0-20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GHSA-j6gg-r5jc-47cm"},{"ecosystem":"Go","fixed":["8.0.0-20250815165020-c8d66301415d"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GO-2025-4126"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/v5","purl":"pkg:golang/github.com/mattermost/mattermost/v5","source":"GO-2025-4126"}],"prev":{"headline":"Memory corruption in Armoury Crate","id":"CVE-2025-11775"},"products":["Mattermost"],"published":"2025-11-14","related":[{"cvss_score":9.9,"headline":"Account takeover on OAuth/OpenID-enabled servers","id":"CVE-2025-12419","kev_date_added":null,"published":"2025-11-27"},{"cvss_score":9.9,"headline":"Account Takeover via Code Exchange Endpoint","id":"CVE-2025-12421","kev_date_added":null,"published":"2025-11-27"},{"cvss_score":9.9,"headline":"Path Traversal Leading to RCE by Any Authenticated Mattermost User","id":"CVE-2025-4981","kev_date_added":null,"published":"2025-06-20"},{"cvss_score":9.9,"headline":"Arbitrary file read via block duplication in Mattermost Boards","id":"CVE-2025-20051","kev_date_added":null,"published":"2025-02-24"},{"cvss_score":9.9,"headline":"Arbitrary file read in Mattermost Boards via import \u0026 export board archive","id":"CVE-2025-25279","kev_date_added":null,"published":"2025-02-24"},{"cvss_score":9.8,"headline":"Mattermost Server: Insufficient Password-Reset Link Invalidation","id":"CVE-2016-11074","kev_date_added":null,"published":"2020-06-19"},{"cvss_score":9.8,"headline":"Mattermost Server allows attackers to gain privileges by accessing unintended API endpoints with users' credentials","id":"CVE-2017-18885","kev_date_added":null,"published":"2020-06-19"}],"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":"2025-11-14","vendors":["Mattermost"]},"summary":"Guest users can discover archived public channels due to improper access control in the search API, exposing channel metadata.","url":"https://insights.sbomify.com/CVE-2025-11776/"}