{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-77991 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-77991 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-77991 is a critical vulnerability in joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla, published on 27 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-77991 and fix it if it is affected.\n\nWhat it is: CVE-2026-77991 is a critical vulnerability in joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla, published on 27 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-77991 in the wild and no public exploit code.\n\nAffected product: joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla. 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-2026-77991/ (Markdown: https://insights.sbomify.com/CVE-2026-77991/index.md)","id":"CVE-2026-77991","markdown":"https://insights.sbomify.com/CVE-2026-77991/index.md","name":"CVE-2026-77991","record":{"aliases":["GHSA-gh3c-9wwf-mj2v"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Joomla Event Manager","requires_auth":"high_privilege","summary":"Privileged attackers can upload dangerous files like PHP to achieve remote code execution in Joomla Event Manager.","user_interaction":"not_required","vuln_class":"file_upload"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Joomla","cpe":[],"cvss":{"score":9.4,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"}],"description":"Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager \u003c 5.0.1 - The administrator source model allows to write dangerous file type incl. PHP, leading to remote code execution.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-09-18","github_poc":1,"max_poc_stars":1,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-18T16:25:53Z","kind":"github_poc","ref":"https://github.com/abraxas/CVE-2026-77991","stars":1,"title":"CVE-2026-77991 - joomlaeventmanager.net - Critical - Privileged POST /administrator/index.php - Remote Code Execution"}],"tier":"poc_unverified"},"has_fix":null,"headline":"Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager \u003c 5.0.1","id":"CVE-2026-77991","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"file_upload","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Joomla Extension - fabrikar.com - heredoc terminator breakout in the calc element in Fabrik \u003c 4.7.2","id":"CVE-2026-77992"},"packages":[],"prev":{"headline":"Missing authorization in JEM - Joomla Event Manager extension for Joomla","id":"CVE-2026-77990"},"products":["JEM - Joomla Event Manager extension for Joomla"],"published":"2026-08-27","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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-28","vendors":["joomlaeventmanager.net"]},"summary":"Privileged attackers can upload dangerous files like PHP to achieve remote code execution in Joomla Event Manager.","url":"https://insights.sbomify.com/CVE-2026-77991/"}