{"answers":{"affected":"20 open source packages ship an affected version, including github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5 and github.com/mattermost/mattermost-server/v6. It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-8402 in the wild and no public exploit code.","fix":"Upgrade github.com/mattermost/mattermost-server to a fixed version for your release line: 10.10.1, 10.5.9, 10.8.4 or 10.9.4.","what":"CVE-2025-8402 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 21 Aug 2025. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-8402 and fix it if it is affected.\n\nWhat it is: CVE-2025-8402 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 21 Aug 2025. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-8402 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/mattermost-server (Go): affected from 10.10.0; fixed in 10.10.1\n- github.com/mattermost/mattermost-server (Go): affected from 10.10.0; fixed in 10.10.1\n- github.com/mattermost/mattermost-server (Go): affected from 10.5.0; fixed in 10.5.9\n- github.com/mattermost/mattermost-server (Go): affected from 10.5.0; fixed in 10.5.9\n- github.com/mattermost/mattermost-server (Go): affected from 10.8.0; fixed in 10.8.4\n- github.com/mattermost/mattermost-server (Go): affected from 10.8.0; fixed in 10.8.4\n- github.com/mattermost/mattermost-server (Go): affected from 10.9.0; fixed in 10.9.4\n- github.com/mattermost/mattermost-server (Go): affected from 10.9.0; fixed in 10.9.4\n- github.com/mattermost/mattermost-server (Go): affected from 9.11.0; fixed in 9.11.18\n- github.com/mattermost/mattermost-server (Go): affected from 9.11.0; fixed in 9.11.18\n- github.com/mattermost/mattermost-server (Go): affected from 9.11.0+incompatible; fixed in 9.11.18+incompatible, 10.5.9+incompatible, 10.8.4+incompatible, 10.9.4+incompatible, 10.10.1+incompatible\n- github.com/mattermost/mattermost-server/v5 (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-2025-8402/ (Markdown: https://insights.sbomify.com/CVE-2025-8402/index.md)","id":"CVE-2025-8402","markdown":"https://insights.sbomify.com/CVE-2025-8402/index.md","name":"CVE-2025-8402","record":{"aliases":["GHSA-h469-4fcf-p23h","GO-2025-3911"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Mattermost collaboration platform","requires_auth":"high_privilege","summary":"A system administrator can crash the Mattermost server by providing invalid data to the bulk import feature due to a nil pointer dereference.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mattermost","cpe":[{"product":"mattermost_server","vendor":"mattermost"}],"cvss":{"score":4.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"},{"id":"CWE-1287","name":"Improper Validation of Specified Type of Input"}],"description":"Mattermost versions 10.8.x \u003c= 10.8.3, 10.5.x \u003c= 10.5.8, 9.11.x \u003c= 9.11.17, 10.10.x \u003c= 10.10.0, 10.9.x \u003c= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.","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":"Nil pointer dereference in bulk import crashes server","id":"CVE-2025-8402","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"mattermost:mattermost_server","products":["mattermost:mattermost_server"],"type":"null_dereference","year":"2025"},"n_packages":20,"n_references":1,"next":{"headline":"Stack buffer overflow vulnerability exists in the Supermicro BMC Shared library","id":"CVE-2025-8404"},"packages":[{"ecosystem":"Go","fixed":["10.10.1"],"introduced":["10.10.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["10.10.1"],"introduced":["10.10.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["10.5.9"],"introduced":["10.5.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["10.5.9"],"introduced":["10.5.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["10.8.4"],"introduced":["10.8.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["10.8.4"],"introduced":["10.8.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["10.9.4"],"introduced":["10.9.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["10.9.4"],"introduced":["10.9.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["9.11.18"],"introduced":["9.11.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["9.11.18"],"introduced":["9.11.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["9.11.18+incompatible","10.5.9+incompatible","10.8.4+incompatible","10.9.4+incompatible","10.10.1+incompatible"],"introduced":["9.11.0+incompatible","10.5.0+incompatible","10.8.0+incompatible","10.9.0+incompatible","10.10.0+incompatible"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GO-2025-3911"},{"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-2025-3911"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["5.39.3"],"package":"github.com/mattermost/mattermost-server/v5","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["5.39.3"],"package":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","source":"GHSA-h469-4fcf-p23h"},{"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-2025-3911"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["6.7.2"],"package":"github.com/mattermost/mattermost-server/v6","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["6.7.2"],"package":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GO-2025-3911"},{"ecosystem":"Go","fixed":["8.0.0-20250708173752-d6b35c41f0ae5"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":null,"source":"GHSA-h469-4fcf-p23h"},{"ecosystem":"Go","fixed":["8.0.0-20250708173752-d6b35c41f0ae5"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GHSA-h469-4fcf-p23h"}],"prev":{"headline":"HT Mega – Absolute Addons For Elementor \u003c= 2.9.1 - Authenticated (Author+) Sensitive Information Exposure","id":"CVE-2025-8401"},"products":["Mattermost"],"published":"2025-08-21","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":"2025-08-21","vendors":["Mattermost"]},"summary":"A system administrator can crash the Mattermost server by providing invalid data to the bulk import feature due to a nil pointer dereference.","url":"https://insights.sbomify.com/CVE-2025-8402/"}