{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-6957 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-6957 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-6957 is a high-severity path traversal vulnerability in Mattermost, published on 27 May 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-6957 and fix it if it is affected.\n\nWhat it is: CVE-2026-6957 is a high-severity path traversal vulnerability in Mattermost, published on 27 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-6957 in the wild and no public exploit code.\n\nAffected product: Mattermost. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-6957/ (Markdown: https://insights.sbomify.com/CVE-2026-6957/index.md)","id":"CVE-2026-6957","markdown":"https://insights.sbomify.com/CVE-2026-6957/index.md","name":"CVE-2026-6957","record":{"aliases":["GHSA-x7w4-j7hv-94wg"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Mattermost Legal Hold plugin","requires_auth":"high_privilege","summary":"A remote administrator can write arbitrary files to the server via unsanitized filenames in federated shared-channel attachments.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mattermost","cpe":[{"product":"legal_hold","vendor":"mattermost"}],"cvss":{"score":8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Mattermost Plugins versions \u003c=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destination paths, which allows an administrator of a remote federated Mattermost server to write files to arbitrary locations within the target server's filestore via a malicious filename delivered through the shared-channel attachment sync protocol. Mattermost Advisory ID: MMSA-2026-00659","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Path traversal in Mattermost","id":"CVE-2026-6957","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Acunetix 25.11.251107123 Local Privilege Escalation via wvsc.exe","id":"CVE-2026-6958"},"packages":[],"prev":{"headline":"Reflected XSS in ATutor","id":"CVE-2026-6956"},"products":["Mattermost"],"published":"2026-05-27","related":[{"cvss_score":8.3,"headline":"Authorization Bypass in Mattermost Legal Hold Plugin Due to Missing Return After Permission Check","id":"CVE-2026-3524","kev_date_added":null,"published":"2026-04-06"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-05-28","vendors":["Mattermost"]},"summary":"A remote administrator can write arbitrary files to the server via unsanitized filenames in federated shared-channel attachments.","url":"https://insights.sbomify.com/CVE-2026-6957/"}