{"id":"CVE-2026-104906","aliases":["EUVD-2026-91742","GHSA-x6q8-3wfm-g2w6"],"status":"published","title":"MISP TAXII Object Viewer Stored XSS via Unescaped JSON Output","description":"MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session.\n\nPreconditions:\n\n- The victim must be an authenticated MISP user with access to the TAXII object viewer.\n\n- The victim must open or view the crafted TAXII object.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.\n\n- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\n\n- Potential for performing actions on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.","severity":{"version":"4.0","score":6.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0036,"percentile":0.30173,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-10-02T15:49:32Z","modified":"2026-10-28T02:30:44Z","products":[{"vendor":"misp","product":"misp"}],"references":[{"url":"https://github.com/MISP/MISP/commit/1bed4ca0c","tags":["patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104906","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-x6q8-3wfm-g2w6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104906.json","tags":["advisory"]},{"url":"https://github.com/MISP/MISP","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-104906","title":"MISP TAXII Object Viewer Stored XSS via Unescaped JSON Output","description":"MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session.\n\nPreconditions:\n\n- The victim must be an authenticated MISP user with access to the TAXII object viewer.\n\n- The victim must open or view the crafted TAXII object.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.\n\n- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\n\n- Potential for performing actions on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.","status":"published","published":"2026-10-02T15:49:32.948Z","modified":"2026-10-02T16:17:21.73Z","cvss":[{"version":"4.0","score":6.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:09.448255Z"}],"euvd":[{"id":"EUVD-2026-91742","description":"MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session.\n\nPreconditions:\n\n- The victim must be an authenticated MISP user with access to the TAXII object viewer.\n\n- The victim must open or view the crafted TAXII object.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.\n\n- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\n\n- Potential for performing actions on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.","status":"published","published":"2026-10-02T15:49:32Z","modified":"2026-10-02T16:17:21Z","cvss":[{"version":"4.0","score":6.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"medium"}],"updated_at":"2026-11-02T17:27:42.693498Z"}],"ghsa":[{"id":"GHSA-x6q8-3wfm-g2w6","title":"MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When...","description":"MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session.\n\nPreconditions:\n\n- The victim must be an authenticated MISP user with access to the TAXII object viewer.\n\n- The victim must open or view the crafted TAXII object.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.\n\n- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\n\n- Potential for performing actions on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.","status":"published","published":"2026-10-02T18:31:27Z","modified":"2026-10-02T18:31:36Z","cvss":[{"version":"4.0","score":6.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:12:43.646433Z"}],"nvd":[{"id":"CVE-2026-104906","description":"MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session.\n\nPreconditions:\n\n- The victim must be an authenticated MISP user with access to the TAXII object viewer.\n\n- The victim must open or view the crafted TAXII object.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.\n\n- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\n\n- Potential for performing actions on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.","status":"published","published":"2026-10-02T16:16:48.01Z","modified":"2026-10-02T17:17:04.633Z","cvss":[{"version":"4.0","score":6.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:53.75133Z"}],"osv":[{"id":"CVE-2026-104906","title":"MISP TAXII Object Viewer Stored XSS via Unescaped JSON Output","description":"MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session.\n\nPreconditions:\n\n- The victim must be an authenticated MISP user with access to the TAXII object viewer.\n\n- The victim must open or view the crafted TAXII object.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.\n\n- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\n\n- Potential for performing actions on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.","status":"published","published":"2026-10-02T15:49:32.948Z","modified":"2026-10-28T02:30:44.781611922Z","cvss":[{"version":"4.0","score":6.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:54.236592Z"}]}}