{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-45121 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-45121 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-45121 is a medium-severity missing authorization vulnerability in mybb, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-45121 and fix it if it is affected.\n\nWhat it is: CVE-2026-45121 is a medium-severity missing authorization vulnerability in mybb, published on 18 Aug 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-2026-45121 in the wild and no public exploit code.\n\nAffected product: mybb. 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-2026-45121/ (Markdown: https://insights.sbomify.com/CVE-2026-45121/index.md)","id":"CVE-2026-45121","markdown":"https://insights.sbomify.com/CVE-2026-45121/index.md","name":"CVE-2026-45121","record":{"aliases":["GHSA-r25v-7pcm-q34p"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"MyBB forum software","requires_auth":"low_privilege","summary":"Authenticated users can view titles of inaccessible calendars due to insufficient permission checks in the MyBB forum software.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":4.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"description":"MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not check permissions consistently when listing calendars, allowing authenticated users to access titles of calendars that are otherwise inaccessible. The affected calendar-selection paths in calendar.php perform permission checks against an invalid calendar context before returning calendar titles. The uniquely identifying implementation details include titles of inaccessible calendars, and invalid calendar permission context. This issue is fixed in version 1.8.40.","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":"MyBB: Insufficient permission check for calendar select","id":"CVE-2026-45121","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"MyBB: Insufficient permission check for calendar event move","id":"CVE-2026-45122"},"packages":[],"prev":{"headline":"MyBB: Insufficient authorization for private calendar events","id":"CVE-2026-45120"},"products":["mybb"],"published":"2026-08-18","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-08-18","vendors":["mybb"]},"summary":"Authenticated users can view titles of inaccessible calendars due to insufficient permission checks in the MyBB forum software.","url":"https://insights.sbomify.com/CVE-2026-45121/"}