{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-45284 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-45284 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-45284 is a medium-severity authentication bypass vulnerability in nextcloud security-advisories, published on 1 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-45284 and fix it if it is affected.\n\nWhat it is: CVE-2026-45284 is a medium-severity authentication bypass vulnerability in nextcloud security-advisories, published on 1 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-45284 in the wild and no public exploit code.\n\nAffected product: nextcloud security-advisories. 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-2026-45284/ (Markdown: https://insights.sbomify.com/CVE-2026-45284/index.md)","id":"CVE-2026-45284","markdown":"https://insights.sbomify.com/CVE-2026-45284/index.md","name":"CVE-2026-45284","record":{"aliases":["GHSA-79xf-ffj8-96fm"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Nextcloud OIDC app","requires_auth":"low_privilege","summary":"Deleted LDAP users could still authenticate via the Nextcloud User OIDC app due to an improper check, allowing unauthorized access.","user_interaction":"required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"user_oidc","vendor":"nextcloud"}],"cvss":{"score":4.6,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-284","name":"Improper Access Control"}],"description":"Nextcloud is an open source content collaboration platform. From version 1.3.6 to before version 8.4.0, an improper check allowed users that where provided by LDAP to still authenticate towards user OIDC after they where deleted. This issue has been patched in version 8.4.0.","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":"Nextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users to authenticate","id":"CVE-2026-45284","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Nextcloud: Hidden Public Link creation when sharing to a Team External Member","id":"CVE-2026-45285"},"packages":[],"prev":{"headline":"Nextcloud: Files Lock app allows users to lock and unlock files of other users","id":"CVE-2026-45283"},"products":["security-advisories"],"published":"2026-06-01","related":[{"cvss_score":8,"headline":"Nextcloud user_oidc app is missing brute force protection","id":"CVE-2023-32074","kev_date_added":null,"published":"2023-05-25"},{"cvss_score":6.3,"headline":"Nextcloud user_oidc app's ID4me feature is available even when disabled","id":"CVE-2024-37312","kev_date_added":null,"published":"2024-06-14"},{"cvss_score":5.4,"headline":"Nextcloud user_oidc's ID4me does not validate signature or expiration","id":"CVE-2024-37886","kev_date_added":null,"published":"2024-06-14"},{"cvss_score":4.8,"headline":"Issuer not verified from obtained token in user_oidc","id":"CVE-2023-39953","kev_date_added":null,"published":"2023-08-10"},{"cvss_score":4.8,"headline":"CSRF protection on user_oidc login returned the expected token in case of an error","id":"CVE-2023-28848","kev_date_added":null,"published":"2023-04-04"},{"cvss_score":3.8,"headline":"user_oidc app stores client secret unencrypted in database","id":"CVE-2023-39954","kev_date_added":null,"published":"2023-08-10"}],"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":"partial"},"state":"PUBLISHED","updated":"2026-06-02","vendors":["nextcloud"]},"summary":"Deleted LDAP users could still authenticate via the Nextcloud User OIDC app due to an improper check, allowing unauthorized access.","url":"https://insights.sbomify.com/CVE-2026-45284/"}