{"id":"CVE-2025-8848","aliases":["EUVD-2025-35577","GHSA-xqvm-m8v9-8w9h"],"status":"published","title":"HTML Injection in Accept-Language Header in danny-avila/librechat","description":"A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept-Language header. When a logged-in user sends an HTTP GET request with a crafted Accept-Language header, arbitrary HTML can be injected into the \u003chtml lang=\"\"\u003e tag of the response. This can lead to potential security risks such as cross-site scripting (XSS) attacks.","severity":{"version":"3.0","score":4.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00453,"percentile":0.39617,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79","CWE-94"],"published":"2025-10-22T13:54:00Z","modified":"2026-10-28T02:31:05Z","exploits":[{"source":"nuclei","id":"CVE-2025-8848","title":"LibreChat \u003c= 0.7.9 - HTML Injection via Accept-Language Header","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8848.yaml"}],"products":[{"vendor":"danny-avila","product":"danny-avila/librechat"},{"vendor":"librechat","product":"librechat"}],"references":[{"url":"https://huntr.com/bounties/a05ebc1f-882a-4adc-b178-d3cefa4b730e","tags":["Exploit","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8848","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xqvm-m8v9-8w9h"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8848.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-8848","title":"HTML Injection in Accept-Language Header in danny-avila/librechat","description":"A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept-Language header. When a logged-in user sends an HTTP GET request with a crafted Accept-Language header, arbitrary HTML can be injected into the \u003chtml lang=\"\"\u003e tag of the response. This can lead to potential security risks such as cross-site scripting (XSS) attacks.","status":"published","published":"2025-10-22T13:54:00.389Z","modified":"2025-10-30T18:22:51.121Z","cvss":[{"version":"3.0","score":4.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T14:32:37.680845Z"}],"euvd":[{"id":"EUVD-2025-35577","description":"A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept-Language header. When a logged-in user sends an HTTP GET request with a crafted Accept-Language header, arbitrary HTML can be injected into the \u003chtml lang=\"\"\u003e tag of the response. This can lead to potential security risks such as cross-site scripting (XSS) attacks.","status":"published","published":"2025-10-22T13:54:00Z","modified":"2025-10-30T18:22:51Z","cvss":[{"version":"3.0","score":4.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:49:35.853861Z"}],"ghsa":[{"id":"GHSA-xqvm-m8v9-8w9h","title":"A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept...","description":"A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept-Language header. When a logged-in user sends an HTTP GET request with a crafted Accept-Language header, arbitrary HTML can be injected into the \u003chtml lang=\"\"\u003e tag of the response. This can lead to potential security risks such as cross-site scripting (XSS) attacks.","status":"published","published":"2025-10-22T15:31:12Z","modified":"2025-10-30T18:32:33Z","cvss":[{"version":"3.0","score":4.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79","CWE-94"],"updated_at":"2026-11-02T15:04:15.956958Z"}],"nvd":[{"id":"CVE-2025-8848","description":"A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept-Language header. When a logged-in user sends an HTTP GET request with a crafted Accept-Language header, arbitrary HTML can be injected into the \u003chtml lang=\"\"\u003e tag of the response. This can lead to potential security risks such as cross-site scripting (XSS) attacks.","status":"published","published":"2025-10-22T14:15:52.393Z","modified":"2026-10-08T11:10:00.25Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"3.0","score":4.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-94","CWE-79"],"updated_at":"2026-11-02T14:11:39.069866Z"}],"osv":[{"id":"CVE-2025-8848","title":"HTML Injection in Accept-Language Header in danny-avila/librechat","description":"A vulnerability in danny-avila/librechat version 0.7.9 allows for HTML injection via the Accept-Language header. When a logged-in user sends an HTTP GET request with a crafted Accept-Language header, arbitrary HTML can be injected into the \u003chtml lang=\"\"\u003e tag of the response. This can lead to potential security risks such as cross-site scripting (XSS) attacks.","status":"published","published":"2025-10-22T13:54:00.389Z","modified":"2026-10-28T02:31:05.380469603Z","cvss":[{"version":"3.0","score":4.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T15:44:53.185592Z"}]}}