{"answers":{"affected":"12 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-2026-6961 in the wild and no public exploit code.","fix":"Upgrade github.com/mattermost/mattermost-server to a fixed version for your release line: 10.11.17, 10.11.17+incompatible, 11.5.5+incompatible or 11.6.1+incompatible.","what":"CVE-2026-6961 is a high-severity path traversal vulnerability in Mattermost Mattermost Server, published on 12 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-6961 and fix it if it is affected.\n\nWhat it is: CVE-2026-6961 is a high-severity path traversal vulnerability in Mattermost Mattermost Server, published on 12 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-6961 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/mattermost-server (Go): affected from 10.11.0; fixed in 10.11.17\n- github.com/mattermost/mattermost-server (Go): affected from 10.11.0; fixed in 10.11.17\n- github.com/mattermost/mattermost-server (Go): affected from 10.11.0+incompatible; fixed in 10.11.17+incompatible, 11.5.5+incompatible, 11.6.1+incompatible\n- github.com/mattermost/mattermost-server (Go): affected from 11.5.0; fixed in 11.5.5\n- github.com/mattermost/mattermost-server (Go): affected from 11.5.0; fixed in 11.5.5\n- github.com/mattermost/mattermost-server (Go): affected from 11.6.0; fixed in 11.6.1\n- github.com/mattermost/mattermost-server (Go): affected from 11.6.0; fixed in 11.6.1\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost/server/v8 (Go): affected from 8.0.0-20250731163400-5b955468ea1e; fixed in 8.0.0-20260423180926-c021eeaff8f0\n- github.com/mattermost/mattermost/server/v8 (Go): affected from 8.0.0-20250731163400-5b955468ea1e; fixed in 8.0.0-20260423180926-c021eeaff8f0\n- github.com/mattermost/mattermost/server/v8 (Go): affected from 8.0.0-20250731163400-5b955468ea1e; fixed in 8.0.0-20260423180926-c021eeaff8f0\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-2026-6961/ (Markdown: https://insights.sbomify.com/CVE-2026-6961/index.md)","id":"CVE-2026-6961","markdown":"https://insights.sbomify.com/CVE-2026-6961/index.md","name":"CVE-2026-6961","record":{"aliases":["GHSA-8qq9-cqj8-82w4","GO-2026-6281"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Mattermost server","requires_auth":"high_privilege","summary":"An attacker controlling a federated server can write files to arbitrary locations on the target Mattermost server via path traversal in filenames.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mattermost","cpe":[{"product":"mattermost_server","vendor":"mattermost"}],"cvss":{"score":7.6,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Mattermost versions 11.6.x \u003c= 11.6.1, 11.5.x \u003c= 11.5.4, 10.11.x \u003c= 10.11.15, 10.11.x \u003c= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661","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":"CVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation sync","id":"CVE-2026-6961","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"mattermost:mattermost_server","products":["mattermost:mattermost_server"],"type":"path_traversal","year":"2026"},"n_packages":12,"n_references":1,"next":{"headline":"Cross-site scripting in Cost of Goods: Product Cost \u0026 Profit Calculator for WooCommerce","id":"CVE-2026-6962"},"packages":[{"ecosystem":"Go","fixed":["10.11.17"],"introduced":["10.11.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-8qq9-cqj8-82w4"},{"ecosystem":"Go","fixed":["10.11.17"],"introduced":["10.11.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-8qq9-cqj8-82w4"},{"ecosystem":"Go","fixed":["10.11.17+incompatible","11.5.5+incompatible","11.6.1+incompatible"],"introduced":["10.11.0+incompatible","11.5.0+incompatible","11.6.0+incompatible"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GO-2026-6281"},{"ecosystem":"Go","fixed":["11.5.5"],"introduced":["11.5.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-8qq9-cqj8-82w4"},{"ecosystem":"Go","fixed":["11.5.5"],"introduced":["11.5.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-8qq9-cqj8-82w4"},{"ecosystem":"Go","fixed":["11.6.1"],"introduced":["11.6.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-8qq9-cqj8-82w4"},{"ecosystem":"Go","fixed":["11.6.1"],"introduced":["11.6.0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-8qq9-cqj8-82w4"},{"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-2026-6281"},{"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-2026-6281"},{"ecosystem":"Go","fixed":["8.0.0-20260423180926-c021eeaff8f0"],"introduced":["8.0.0-20250731163400-5b955468ea1e"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":null,"source":"GHSA-8qq9-cqj8-82w4"},{"ecosystem":"Go","fixed":["8.0.0-20260423180926-c021eeaff8f0"],"introduced":["8.0.0-20250731163400-5b955468ea1e"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GHSA-8qq9-cqj8-82w4"},{"ecosystem":"Go","fixed":["8.0.0-20260423180926-c021eeaff8f0"],"introduced":["8.0.0-20250731163400-5b955468ea1e"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GO-2026-6281"}],"prev":{"headline":"BookingPress Pro \u003c= 5.6 - Unauthenticated Arbitrary File Upload via Signature Custom Field","id":"CVE-2026-6960"},"products":["Mattermost"],"published":"2026-06-12","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":"total"},"state":"PUBLISHED","updated":"2026-06-16","vendors":["Mattermost"]},"summary":"An attacker controlling a federated server can write files to arbitrary locations on the target Mattermost server via path traversal in filenames.","url":"https://insights.sbomify.com/CVE-2026-6961/"}