{"answers":{"affected":"1 open source package ship an affected version, including mattermost. It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-4478 in the wild and no public exploit code.","fix":"Upgrade mattermost to a fixed version for your release line: 7.8.9 or 7.10.5.","what":"CVE-2023-4478 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 25 Aug 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2023-4478 and fix it if it is affected.\n\nWhat it is: CVE-2023-4478 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 25 Aug 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2023-4478 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- mattermost (Bitnami): affected all versions up to 8.0.0; fixed in 7.8.9, 7.10.5\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-2023-4478/ (Markdown: https://insights.sbomify.com/CVE-2023-4478/index.md)","id":"CVE-2023-4478","markdown":"https://insights.sbomify.com/CVE-2023-4478/index.md","name":"CVE-2023-4478","record":{"aliases":["BIT-mattermost-2023-4478","GHSA-65h8-5q72-mrp3"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Mattermost collaboration platform","requires_auth":"none","summary":"Attackers can register inactive accounts by tampering with signup parameters, preventing legitimate users from accessing the system without admin intervention.","user_interaction":"required","vuln_class":"business_logic"},"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:N/UI:R/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"}],"description":"Mattermost fails to restrict which parameters' values it takes from the request during signup allowing an attacker to register users as inactive, thus blocking them from later accessing Mattermost without the system admin activating their accounts.","ecosystems":["Bitnami"],"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":"Parameter tampering in the registration resulting in blocked accounts to be created","id":"CVE-2023-4478","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"mattermost:mattermost_server","products":["mattermost:mattermost_server"],"type":"business_logic","year":"2023"},"n_packages":1,"n_references":1,"next":{"headline":"Stored XSS Vulnerability in M-Files Web","id":"CVE-2023-4479"},"packages":[{"ecosystem":"Bitnami","fixed":["7.8.9","7.10.5"],"introduced":["0","7.9.0","8.0.0"],"last_affected":["8.0.0"],"package":"mattermost","purl":"pkg:bitnami/mattermost","source":"BIT-mattermost-2023-4478"}],"prev":{"headline":"Locatoraid Store Locator \u003c 3.9.24 - Reflected XSS","id":"CVE-2023-4476"},"products":["Mattermost"],"published":"2023-08-25","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":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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":"partial"},"state":"PUBLISHED","updated":"2024-09-30","vendors":["Mattermost"]},"summary":"Attackers can register inactive accounts by tampering with signup parameters, preventing legitimate users from accessing the system without admin intervention.","url":"https://insights.sbomify.com/CVE-2023-4478/"}