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Medium

MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline Handler

Type: advisorySource: Official CVE List1 source record

MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script. Preconditions: - A linked/remote MISP server is configured and connected to the local instance. - The linked server supplies a crafted tag ID in an event. - An authenticated user views the event preview and interacts with the affected tag element. Impact: - Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user. Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).

Announced Source revision 1
Original source ↗

CVE-2026-104907

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-104907

MISP

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"
    ],
    "repo": "https://github.com/MISP/MISP",
    "vendor": "MISP",
    "modules": [
      "Servers/preview_event"
    ],
    "product": "MISP",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "2.5.48",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "app/View/Servers/preview_event.ctp"
    ]
  }
]
Related CVEs
CVE-2026-104907

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#8028 · Revision 1
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Publisher date
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