{"id":"CVE-2026-28509","summary":"LangBot has a Cross Site Scripting(XSS) Vulnerability","details":"LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.","aliases":["GHSA-w8gq-g4pc-xh3h"],"modified":"2026-04-10T05:41:20.837672Z","published":"2026-03-06T04:16:58.761Z","database_specific":{"cwe_ids":["CWE-79"],"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28509.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28509.json"},{"type":"ADVISORY","url":"https://github.com/langbot-app/LangBot/security/advisories/GHSA-w8gq-g4pc-xh3h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28509"},{"type":"FIX","url":"https://github.com/langbot-app/LangBot/commit/614621ab7b84fe50da3c6137705cde5a99429866"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/langbot-app/langbot","events":[{"introduced":"0"},{"fixed":"b34ebf85a6445060bbe6770713717624cdd6c03d"}]}],"versions":["noReleaseProvided","v.4.4.2b1","v0.1.0","v1.0.0","v1.1.0","v1.2.0","v2.0.0","v2.1.0","v2.1.1","v2.1.2","v2.1.3","v2.1.4","v2.2.0","v2.2.1","v2.2.2","v2.2.3","v2.2.4","v2.2.5","v2.3.0","v2.3.1","v2.3.2","v2.3.3","v2.3.4","v2.3.5","v2.3.6","v2.3.7","v2.3.8","v2.3.9","v2.4.0","v2.4.1","v2.4.2","v2.4.3","v2.4.3.1","v2.4.5","v2.4.6","v2.4.7","v2.5.0","v2.5.1","v2.5.2","v2.6.0","v2.6.1","v2.6.10","v2.6.2","v2.6.3","v2.6.4","v2.6.5","v2.6.6","v2.6.7","v2.6.8","v2.6.9","v3.0.0","v3.0.1","v3.0.1.3","v3.0.2","v3.1.0","v3.1.0.1","v3.1.0.2","v3.1.0.3","v3.1.0.4","v3.1.1","v3.2.0","v3.2.0.1","v3.2.1","v3.2.2","v3.2.3","v3.2.4","v3.3.0","v3.3.0.1","v3.3.0.2","v3.3.1.0","v3.3.1.1","v3.4.0","v3.4.0.1","v3.4.0.2","v3.4.1","v3.4.1.1","v3.4.1.2","v3.4.1.3","v3.4.1.4","v3.4.1.5","v3.4.1.6-pre","v3.4.10","v3.4.10.1","v3.4.10.2","v3.4.10.3","v3.4.10.4","v3.4.11","v3.4.11.1","v3.4.11.2","v3.4.12","v3.4.12.1","v3.4.13","v3.4.13.1","v3.4.14","v3.4.14.1","v3.4.14.2","v3.4.14.3","v3.4.2","v3.4.2.1","v3.4.3","v3.4.3.1","v3.4.3.2","v3.4.4","v3.4.4.1","v3.4.5","v3.4.5.1","v3.4.5.2","v3.4.6","v3.4.6.1","v3.4.6.2","v3.4.7","v3.4.7.1","v3.4.7.2","v3.4.8","v3.4.9","v3.4.9.1","v3.4.9.2","v3.4.9.3","v3.4.9.4","v3.4.9.5","v4.0.0","v4.0.0-beta.1","v4.0.0-beta.2","v4.0.1","v4.0.2","v4.0.3","v4.0.3.1","v4.0.3.2","v4.0.3.3","v4.0.4","v4.0.5","v4.0.6","v4.0.7","v4.0.8","v4.0.8.1","v4.0.9","v4.1.0","v4.1.1","v4.1.2","v4.2.0","v4.2.1","v4.2.2","v4.3.0","v4.3.0.beta2","v4.3.1","v4.3.2","v4.3.3","v4.3.4","v4.3.5","v4.3.6","v4.3.7","v4.3.7b1","v4.3.8","v4.3.9","v4.4.0","v4.4.1","v4.4.2b1","v4.5.0","v4.5.1b1","v4.5.1b2","v4.5.1b3","v4.5.3","v4.5.4","v4.6.0","v4.6.1","v4.6.2","v4.6.3","v4.6.4","v4.6.5","v4.7.0","v4.7.1","v4.7.2","v4.8.0","v4.8.1","v4.8.2","v4.8.3","v4.8.4","v4.8.5","v4.8.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28509.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N"}]}