{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-20786 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20786 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20786 is a medium-severity vulnerability in Japan Total System Co.,Ltd. GroupSession, published on 28 Jul 2021. 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-2021-20786 and fix it if it is affected.\n\nWhat it is: CVE-2021-20786 is a medium-severity vulnerability in Japan Total System Co.,Ltd. GroupSession, published on 28 Jul 2021. 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-2021-20786 in the wild and no public exploit code.\n\nAffected product: Japan Total System Co.,Ltd. GroupSession. 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-2021-20786/ (Markdown: https://insights.sbomify.com/CVE-2021-20786/index.md)","id":"CVE-2021-20786","markdown":"https://insights.sbomify.com/CVE-2021-20786/index.md","name":"CVE-2021-20786","record":{"aliases":["GHSA-crxm-j8cj-fgm7"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"GroupSession collaboration","requires_auth":"none","summary":"A CSRF vulnerability in GroupSession allows remote attackers to hijack administrator sessions via crafted URLs, requiring an upgrade to secure the application.","user_interaction":"required","vuln_class":"csrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"groupsession","vendor":"groupsession"},{"product":"groupsession_bycloud","vendor":"groupsession"},{"product":"groupsession_zion","vendor":"groupsession"}],"cvss":{"score":4.3,"severity":"medium","source":"nvd","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-352","name":"Cross-Site Request Forgery"}],"description":"Cross-site request forgery (CSRF) vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to hijack the authentication of administrators via a specially crafted URL.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Cross-site request forgery in GroupSession","id":"CVE-2021-20786","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"csrf","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Cross-site scripting in GroupSession","id":"CVE-2021-20787"},"packages":[],"prev":{"headline":"Cross-site scripting in GroupSession","id":"CVE-2021-20785"},"products":["GroupSession"],"published":"2021-07-28","related":[{"cvss_score":7.5,"headline":"Missing authorization in GroupSession Free edition, GroupSession byCloud, GroupSession ZION","id":"CVE-2021-20874","kev_date_added":null,"published":"2021-12-24"},{"cvss_score":6.9,"headline":"Cross-site request forgery in GroupSession Free edition","id":"CVE-2025-61987","kev_date_added":null,"published":"2025-12-12"},{"cvss_score":6.8,"headline":"Path traversal in GroupSession Free edition, GroupSession byCloud, GroupSession ZION","id":"CVE-2021-20876","kev_date_added":null,"published":"2021-12-24"},{"cvss_score":6.5,"headline":"Information disclosure in GroupSession","id":"CVE-2017-2165","kev_date_added":null,"published":"2017-06-09"},{"cvss_score":6.1,"headline":"Open redirect in GroupSession Free edition, GroupSession byCloud, GroupSession ZION","id":"CVE-2021-20875","kev_date_added":null,"published":"2021-12-24"},{"cvss_score":6.1,"headline":"Open redirect in GroupSession","id":"CVE-2021-20789","kev_date_added":null,"published":"2021-07-28"},{"cvss_score":6.1,"headline":"Open redirect in GroupSession","id":"CVE-2017-2166","kev_date_added":null,"published":"2018-01-26"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Japan Total System Co.,Ltd."]},"summary":"A CSRF vulnerability in GroupSession allows remote attackers to hijack administrator sessions via crafted URLs, requiring an upgrade to secure the application.","url":"https://insights.sbomify.com/CVE-2021-20786/"}