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MISP Stored Cross-Site Scripting (XSS) via Unvalidated Event Graph Preview Image

Type: advisorySource: Official CVE List1 source record

MISP contains a stored cross-site script (XSS) vulnerability in the event graph preview feature. The event graph preview image field was accepted and stored without server-side validation. On the client side, the stored value was rendered into an HTML img element's src attribute via string concatenation, allowing a crafted value to break out of the attribute context and inject arbitrary script. Preconditions: - An authenticated MISP user with the ability to create or modify an event graph entry. - A second user (the victim) who views the event graph and triggers the preview popover. Impact: - Execution of arbitrary JavaScript in the victim's browser within the MISP application context. - Potential theft of session tokens, cookies, or sensitive data accessible to the victim's browser. - Potential for performing actions on behalf of the victim within the MISP application. Affected: MISP versions prior to the fix (commit applied after v2.5.48).

Announced Source revision 1
Original source ↗

CVE-2026-103321

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-2026-103321

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": [
      "EventGraph model",
      "event-graph.js client-side rendering"
    ],
    "product": "MISP",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "2.5.48",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "app/Model/EventGraph.php",
      "app/webroot/js/event-graph.js"
    ]
  }
]
Related CVEs
CVE-2026-103321

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#4188 · Revision 1
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