{"answers":{"affected":"8 open source packages ship an affected version, including github.com/mattermost/mattermost/server/v8 and github.com/mattermost/mattermost-server/v6. It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-40703 in the wild and no public exploit code.","fix":"Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 8.1.4, 9.0.2 or 9.1.1.","what":"CVE-2023-40703 is a medium-severity denial of service vulnerability in Mattermost Mattermost, published on 27 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-40703 and fix it if it is affected.\n\nWhat it is: CVE-2023-40703 is a medium-severity denial of service vulnerability in Mattermost Mattermost, published on 27 Nov 2023. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2023-40703 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/mattermost/server/v8 (Go): affected all versions; fixed in 8.1.4\n- github.com/mattermost/mattermost/server/v8 (Go): affected all versions; fixed in 8.1.4\n- github.com/mattermost/mattermost/server/v8 (Go): affected from 9.0.0; fixed in 9.0.2\n- github.com/mattermost/mattermost/server/v8 (Go): affected from 9.0.0; fixed in 9.0.2\n- github.com/mattermost/mattermost/server/v8 (Go): affected from 9.1.0; fixed in 9.1.1\n- github.com/mattermost/mattermost/server/v8 (Go): affected from 9.1.0; fixed in 9.1.1\n- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; fixed in 7.8.13\n- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; fixed in 7.8.13\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-2023-40703/ (Markdown: https://insights.sbomify.com/CVE-2023-40703/index.md)","id":"CVE-2023-40703","markdown":"https://insights.sbomify.com/CVE-2023-40703/index.md","name":"CVE-2023-40703","record":{"aliases":["GHSA-c37r-v8jx-7cv2"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Mattermost Boards","requires_auth":"low_privilege","summary":"Attackers can cause denial of service in Mattermost Boards by sending specially crafted block fields that consume excessive resources.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mattermost","cpe":[{"product":"mattermost","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:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string.","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":"Denial of Service via specially crafted block fields in Mattermost Boards","id":"CVE-2023-40703","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"mattermost:mattermost","products":["mattermost:mattermost"],"type":"denial_of_service","year":"2023"},"n_packages":8,"n_references":1,"next":{"headline":"Philips Vue PACS Use of Default Credentials","id":"CVE-2023-40704"},"packages":[{"ecosystem":"Go","fixed":["7.8.13"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v6","purl":null,"source":"GHSA-c37r-v8jx-7cv2"},{"ecosystem":"Go","fixed":["7.8.13"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","source":"GHSA-c37r-v8jx-7cv2"},{"ecosystem":"Go","fixed":["8.1.4"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":null,"source":"GHSA-c37r-v8jx-7cv2"},{"ecosystem":"Go","fixed":["8.1.4"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GHSA-c37r-v8jx-7cv2"},{"ecosystem":"Go","fixed":["9.0.2"],"introduced":["9.0.0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":null,"source":"GHSA-c37r-v8jx-7cv2"},{"ecosystem":"Go","fixed":["9.0.2"],"introduced":["9.0.0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GHSA-c37r-v8jx-7cv2"},{"ecosystem":"Go","fixed":["9.1.1"],"introduced":["9.1.0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":null,"source":"GHSA-c37r-v8jx-7cv2"},{"ecosystem":"Go","fixed":["9.1.1"],"introduced":["9.1.0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GHSA-c37r-v8jx-7cv2"}],"prev":{"headline":"PingOne MFA Integration Kit MFA bypass","id":"CVE-2023-40702"},"products":["Mattermost"],"published":"2023-11-27","related":[{"cvss_score":9.1,"headline":"Path traversal in n/a","id":"CVE-2019-20851","kev_date_added":null,"published":"2020-06-19"},{"cvss_score":8.7,"headline":"Malicious remote can add users to arbitrary teams and channels","id":"CVE-2024-39274","kev_date_added":null,"published":"2024-08-01"},{"cvss_score":8.7,"headline":"Malicious remote can invite itself to an arbitrary local channel","id":"CVE-2024-39777","kev_date_added":null,"published":"2024-08-01"},{"cvss_score":8.1,"headline":"Timing attack during remote cluster token comparison when shared channels are enabled","id":"CVE-2024-39830","kev_date_added":null,"published":"2024-07-03"},{"cvss_score":8.1,"headline":"Lack of server certificate validation in websockets connection","id":"CVE-2023-3615","kev_date_added":null,"published":"2023-07-17"},{"cvss_score":7.5,"headline":"Information disclosure in n/a","id":"CVE-2020-13891","kev_date_added":null,"published":"2020-06-26"},{"cvss_score":7.4,"headline":"Existing local user overwritten by malicious remote","id":"CVE-2024-36492","kev_date_added":null,"published":"2024-08-01"}],"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":"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":"2025-06-03","vendors":["Mattermost"]},"summary":"Attackers can cause denial of service in Mattermost Boards by sending specially crafted block fields that consume excessive resources.","url":"https://insights.sbomify.com/CVE-2023-40703/"}