CVE-2026-104900 (GCVE-0-2026-104900)
Vulnerability from cvelistv5
Published
2026-10-02 15:16
Modified
2026-10-02 16:15
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
MISP contains a stored cross-site scripting (XSS) vulnerability in the index table rendering of the remote event preview. The count field template escaped the associated link URL but rendered the field value without HTML encoding. An attacker with the ability to create or modify events on a linked (remote) MISP server could craft an event identifier containing HTML or JavaScript markup. When a user on the local MISP instance views the remote event preview index, the unescaped value is rendered directly in the browser, allowing arbitrary script execution in the victim's session.
Preconditions:
- A linked/remote MISP server is configured and connected to the local instance.
- The attacker has sufficient access on the linked server to create or modify an event with a crafted identifier.
- A victim user on the local instance views the remote event preview index page.
Impact:
- Execution of arbitrary JavaScript in the context of the MISP web application.
- Potential session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user.
Affected versions: <2.5.48.
References
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|---|---|---|
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This is a textbook stored/reflected XSS due to missing output encoding.\"}], \"tagVersionBoundary\": {\"tag\": \"v2.5.48\", \"version\": \"2.5.48\", \"repository\": \"https://github.com/MISP/MISP\", \"version_type\": \"semver\", \"commits_after_fix\": 31}}}, \"bcp-05-x-03\": {\"x_timeline\": {\"events\": [{\"id\": \"evt-fix-developed-1\", \"type\": \"fix-developed\", \"timestamp\": \"2026-09-24T20:20:05Z\", \"references\": [\"https://github.com/MISP/MISP/commit/2a2981a27.patch\"], \"description\": \"Corrective change authored (2a2981a27bd06bfd6fa37866db1911637d52538c): fix: [security] Escape the value of the count index field\"}]}}}, \"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-1\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-1 Cross Site Scripting\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 5.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"LOW\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"LOW\", \"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\": \"2026-10-01T11:32:45Z\"}}, \"format\": \"SSVC\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/MISP/MISP\", \"vendor\": \"MISP\", \"modules\": [\"Remote Event Preview Index Table (count field)\"], \"product\": \"MISP\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.5.48\", \"versionType\": \"semver\"}], \"programFiles\": [\"app/View/Elements/genericElements/IndexTable/Fields/count.ctp\"]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The vulnerability is remediated by applying HTML entity encoding to the count field value before it is rendered in the view template. 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The count field template escaped the associated link URL but rendered the field value without HTML encoding. An attacker with the ability to create or modify events on a linked (remote) MISP server could craft an event identifier containing HTML or JavaScript markup. When a user on the local MISP instance views the remote event preview index, the unescaped value is rendered directly in the browser, allowing arbitrary script execution in the victim\u0027s session.\\n\\nPreconditions:\\n\\n- A linked/remote MISP server is configured and connected to the local instance.\\n\\n- The attacker has sufficient access on the linked server to create or modify an event with a crafted identifier.\\n\\n- A victim user on the local instance views the remote event preview index page.\\n\\nImpact:\\n\\n- Execution of arbitrary JavaScript in the context of the MISP web application.\\n\\n- Potential session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user.\\n\\nAffected versions: \u003c2.5.48.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eMISP contains a stored cross-site scripting (XSS) vulnerability in the index table rendering of the remote event preview. The count field template escaped the associated link URL but rendered the field value without HTML encoding. An attacker with the ability to create or modify events on a linked (remote) MISP server could craft an event identifier containing HTML or JavaScript markup. When a user on the local MISP instance views the remote event preview index, the unescaped value is rendered directly in the browser, allowing arbitrary script execution in the victim\u0027s session.\u003c/p\u003e\u003cp\u003ePreconditions:\u003c/p\u003e\u003cp\u003e- A linked/remote MISP server is configured and connected to the local instance.\u003c/p\u003e\u003cp\u003e- The attacker has sufficient access on the linked server to create or modify an event with a crafted identifier.\u003c/p\u003e\u003cp\u003e- A victim user on the local instance views the remote event preview index page.\u003c/p\u003e\u003cp\u003eImpact:\u003c/p\u003e\u003cp\u003e- Execution of arbitrary JavaScript in the context of the MISP web application.\u003c/p\u003e\u003cp\u003e- Potential session hijacking, data exfiltration, or unauthorized actions performed 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\": \"2026-10-02T15:16:27.485Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-104900\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-02T16:15:09.284Z\", \"dateReserved\": \"2026-10-02T15:16:25.316Z\", \"assignerOrgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"datePublished\": \"2026-10-02T15:16:27.485Z\", \"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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