{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2021-20787 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20787 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20787 is a medium-severity cross-site scripting vulnerability in Japan Total System Co.,Ltd. GroupSession, published on 28 Jul 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-20787 and fix it if it is affected.\n\nWhat it is: CVE-2021-20787 is a medium-severity cross-site scripting vulnerability in Japan Total System Co.,Ltd. GroupSession, published on 28 Jul 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-20787 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-2021-20787/ (Markdown: https://insights.sbomify.com/CVE-2021-20787/index.md)","id":"CVE-2021-20787","markdown":"https://insights.sbomify.com/CVE-2021-20787/index.md","name":"CVE-2021-20787","record":{"aliases":["GHSA-536v-gg7v-fc83"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"GroupSession collaboration","requires_auth":"high_privilege","summary":"Remote attackers can inject arbitrary scripts via crafted requests in GroupSession, potentially leading to code execution or account takeover.","user_interaction":"required","vuln_class":"xss"},"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":4.8,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Cross-site scripting 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 inject an arbitrary script by sending a specially crafted request to a specific 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 scripting in GroupSession","id":"CVE-2021-20787","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Server-side request forgery in GroupSession","id":"CVE-2021-20788"},"packages":[],"prev":{"headline":"Cross-site request forgery in GroupSession","id":"CVE-2021-20786"},"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":"Remote attackers can inject arbitrary scripts via crafted requests in GroupSession, potentially leading to code execution or account takeover.","url":"https://insights.sbomify.com/CVE-2021-20787/"}