{"answers":{"affected":"3 open source packages ship an affected version, including github.com/mattermost/mattermost-plugin-boards. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-2461 in the wild and no public exploit code.","fix":"Upgrade github.com/mattermost/mattermost-plugin-boards to 0.0.0-20260108044135-57c5be5b6ef5 or later.","what":"CVE-2026-2461 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 16 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-2461 and fix it if it is affected.\n\nWhat it is: CVE-2026-2461 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 16 Mar 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-2026-2461 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/mattermost-plugin-boards (Go): affected all versions; fixed in 0.0.0-20260108044135-57c5be5b6ef5\n- github.com/mattermost/mattermost-plugin-boards (Go): affected all versions; fixed in 0.0.0-20260108044135-57c5be5b6ef5\n- github.com/mattermost/mattermost-plugin-boards (Go): affected all versions; fixed in 0.0.0-20260108044135-57c5be5b6ef5\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-2026-2461/ (Markdown: https://insights.sbomify.com/CVE-2026-2461/index.md)","id":"CVE-2026-2461","markdown":"https://insights.sbomify.com/CVE-2026-2461/index.md","name":"CVE-2026-2461","record":{"aliases":["GHSA-hf8w-x9h5-5gf9","GO-2026-4782"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Mattermost plugin","requires_auth":"low_privilege","summary":"An attacker with editor permissions can modify comments created by other users due to missing authorization checks in Mattermost plugins.","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:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"}],"description":"Mattermost Plugins versions \u003c=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":"2026-01-30","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-01-30T23:38:17Z","kind":"github_poc","ref":"https://github.com/destiny-creates/CVE-2026-2461-poc","stars":0,"title":"POC in python for CVE-2026-2461"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Missing authorization check allows unauthorized modification of other users' comments on a board","id":"CVE-2026-2461","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"mattermost:mattermost_server","products":["mattermost:mattermost_server"],"type":"missing_authorization","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"Admin RCE via Malicious Plugin Upload on CI Test Instances","id":"CVE-2026-2462"},"packages":[{"ecosystem":"Go","fixed":["0.0.0-20260108044135-57c5be5b6ef5"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-plugin-boards","purl":null,"source":"GHSA-hf8w-x9h5-5gf9"},{"ecosystem":"Go","fixed":["0.0.0-20260108044135-57c5be5b6ef5"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-plugin-boards","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-boards","source":"GHSA-hf8w-x9h5-5gf9"},{"ecosystem":"Go","fixed":["0.0.0-20260108044135-57c5be5b6ef5"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-plugin-boards","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-boards","source":"GO-2026-4782"}],"prev":{"headline":"Missing authorization in Relion REB500","id":"CVE-2026-2460"},"products":["Mattermost"],"published":"2026-03-16","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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-16","vendors":["Mattermost"]},"summary":"An attacker with editor permissions can modify comments created by other users due to missing authorization checks in Mattermost plugins.","url":"https://insights.sbomify.com/CVE-2026-2461/"}