CVE-2026-104906 (GCVE-0-2026-104906)
Vulnerability from cvelistv5
Published
2026-10-02 15:49
Modified
2026-10-02 16:17
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
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.
Preconditions:
- The victim must be an authenticated MISP user with access to the TAXII object viewer.
- The victim must open or view the crafted TAXII object.
Impact:
- Execution of arbitrary JavaScript in the victim's browser within the MISP application context.
- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.
- Potential for performing actions on behalf of the authenticated user.
Affected versions: <2.5.48.
References
| URL | Tags | |
|---|---|---|
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The uncertainty is that the exact delivery mechanism (stored in a TAXII server vs. reflected) is not fully specified in the patch, but the core pattern of unencoded user-controlled data in an HTML context matches CAPEC-66 precisely.\"}], \"patchTruncated\": false, \"modelComparison\": {\"rankings\": [{\"model\": \"qwen3.8:27b\", \"score\": 8, \"confidence\": \"high\", \"agreementScore\": 11, \"assumptionCount\": 5}], \"selectedModel\": \"qwen3.8:27b\", \"selectionMethod\": \"deterministic-consensus-v1\", \"selectionNotice\": \"The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required.\"}, \"weaknessRationale\": [{\"cweId\": \"CWE-79\", \"rationale\": \"The patch directly addresses the failure to HTML-encode untrusted JSON data before embedding it in an HTML context. The h() wrapper is the canonical fix for CWE-79 in CakePHP applications. The data originates from external TAXII objects and is rendered without encoding, allowing script injection.\"}], \"tagVersionBoundary\": {\"tag\": \"v2.5.48\", \"version\": \"2.5.48\", \"repository\": \"https://github.com/MISP/MISP\", \"version_type\": \"semver\", \"commits_after_fix\": 29}}}, \"bcp-05-x-03\": {\"x_timeline\": {\"events\": [{\"id\": \"evt-fix-developed-1\", \"type\": \"fix-developed\", \"timestamp\": \"2026-09-24T21:24:48Z\", \"references\": [\"https://github.com/MISP/MISP/commit/1bed4ca0c.patch\"], \"description\": \"Corrective change authored (1bed4ca0c990a4c285e8caa1d7efd91fec43eaca): fix: [security] Escape the JSON shown in the generic JSON\"}]}}}, \"recordType\": \"advisory\"}], \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Jeroen Pinoy\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"iglocska\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Claude Opus 5.5 (1M context)\"}], \"impacts\": [{\"capecId\": \"CAPEC-66\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-66 Cross Site Scripting (XSS)\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 6.2, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"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\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"ACTIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"LOW\", \"subIntegrityImpact\": \"HIGH\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"other\": {\"type\": \"SSVC\", \"content\": {\"role\": \"Supplier\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-02T15:47:29Z\"}}, \"format\": \"SSVC\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/MISP/MISP\", \"vendor\": \"MISP\", \"modules\": [\"TAXII object viewer\", \"app/View/Elements/genericElements/json.ctp\"], \"product\": \"MISP\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.5.48\", \"versionType\": \"semver\"}], \"programFiles\": [\"app/View/Elements/genericElements/json.ctp\"]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The fix applies HTML-encoding (via the h() helper) to the JSON string before it is interpolated into the HTML pre element. This ensures that any HTML or script markup present in the JSON string properties of a TAXII object is rendered as inert text rather than being parsed and executed by the browser, eliminating the XSS vector.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe fix applies HTML-encoding (via the h() helper) to the JSON string before it is interpolated into the HTML pre element. This ensures that any HTML or script markup present in the JSON string properties of a TAXII object is rendered as inert text rather than being parsed and executed by the browser, eliminating the XSS vector.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://github.com/MISP/MISP/commit/1bed4ca0c\", \"name\": \"Security patch\", \"tags\": [\"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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\u0027s MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim\u0027s 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\u0027s 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eMISP 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\u0027s MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim\u0027s MISP session.\u003c/p\u003e\u003cp\u003ePreconditions:\u003c/p\u003e\u003cp\u003e- The victim must be an authenticated MISP user with access to the TAXII object viewer.\u003c/p\u003e\u003cp\u003e- The victim must open or view the crafted TAXII object.\u003c/p\u003e\u003cp\u003eImpact:\u003c/p\u003e\u003cp\u003e- Execution of arbitrary JavaScript in the victim\u0027s browser within the MISP application context.\u003c/p\u003e\u003cp\u003e- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\u003c/p\u003e\u003cp\u003e- Potential for performing actions on behalf of the authenticated user.\u003c/p\u003e\u003cp\u003eAffected versions: \u0026lt;2.5.48.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"shortName\": \"CIRCL\", \"dateUpdated\": \"2026-10-02T15:49:32.948Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-104906\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-02T16:17:21.730Z\", \"dateReserved\": \"2026-10-02T15:49:31.457Z\", \"assignerOrgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"datePublished\": \"2026-10-02T15:49:32.948Z\", \"assignerShortName\": \"CIRCL\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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