{"answers":{"affected":"6 open source packages ship an affected version, including github.com/mattermost/mattermost-server/v5, mattermost and github.com/mattermost/mattermost. It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-14457 in the wild and no public exploit code.","fix":"Upgrade github.com/mattermost/mattermost-server/v5 to 5.20.0 or later.","what":"CVE-2020-14457 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 19 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-14457 and fix it if it is affected.\n\nWhat it is: CVE-2020-14457 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 19 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-14457 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; fixed in 5.20.0\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; fixed in 5.20.0\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; fixed in 5.20.0\n- mattermost (Bitnami): affected all versions; fixed in 5.20.0\n- github.com/mattermost/mattermost (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost-server (Go): affected all versions; 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-2020-14457/ (Markdown: https://insights.sbomify.com/CVE-2020-14457/index.md)","id":"CVE-2020-14457","markdown":"https://insights.sbomify.com/CVE-2020-14457/index.md","name":"CVE-2020-14457","record":{"aliases":["BIT-mattermost-2020-14457","GHSA-j2h2-cvwh-cr64","GO-2023-1939"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Mattermost Server","requires_auth":"none","summary":"Non-members can receive broadcasted team details via WebSocket events, exposing sensitive information to unauthorized users.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"mattermost_server","vendor":"mattermost"}],"cvss":{"score":5.3,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[],"description":"An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the update_team WebSocket event, aka MMSA-2020-0012.","ecosystems":["Bitnami","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":"Mattermost Server Sensitive Data Exposure","id":"CVE-2020-14457","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"mattermost:mattermost_server","products":["mattermost:mattermost_server"],"type":"information_disclosure","year":"2020"},"n_packages":6,"n_references":1,"next":{"headline":"Information disclosure in n/a","id":"CVE-2020-14458"},"packages":[{"ecosystem":"Bitnami","fixed":["5.20.0"],"introduced":["0"],"last_affected":[],"package":"mattermost","purl":"pkg:bitnami/mattermost","source":"BIT-mattermost-2020-14457"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost","purl":"pkg:golang/github.com/mattermost/mattermost","source":"GO-2023-1939"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GO-2023-1939"},{"ecosystem":"Go","fixed":["5.20.0"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v5","purl":null,"source":"GHSA-j2h2-cvwh-cr64"},{"ecosystem":"Go","fixed":["5.20.0"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","source":"GHSA-j2h2-cvwh-cr64"},{"ecosystem":"Go","fixed":["5.20.0"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","source":"GO-2023-1939"}],"prev":{"headline":"Security feature bypass in n/a","id":"CVE-2020-14456"},"products":["n/a"],"published":"2020-06-19","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":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"Non-members can receive broadcasted team details via WebSocket events, exposing sensitive information to unauthorized users.","url":"https://insights.sbomify.com/CVE-2020-14457/"}