GCVE-1-2026-20021 (CVE-2026-53693)

Vulnerability from gna-1 – Published: 2026-06-10 14:32 – Updated: 2026-06-10 14:34
VLAI
Title
MISP BSimVis stored cross-site scripting in tag and cluster rendering paths via unescaped tag metadata and UI labels
Summary
A stored cross-site scripting vulnerability existed in MISP BSimVis tag rendering code. Several client-side rendering paths interpolated tag names, collection names, entity identifiers, cluster names, and tag metadata directly into HTML, HTML attributes, inline JavaScript event handlers, and CSS style values without context-appropriate escaping. The patch adds shared escaping helpers for HTML, attributes, JavaScript strings, and CSS color validation, then applies them across tag badges, tooltips, context menus, cluster cards, autocomplete suggestions, and dynamically inserted tag cards. An attacker able to create or influence stored tag or metadata values could inject a crafted payload that is later rendered in another user’s browser. Successful exploitation could execute arbitrary JavaScript in the victim’s session when they view affected BSimVis pages, potentially allowing the attacker to perform actions as the victim, read data available to the victim, or alter displayed application content. This issue affects MISP bsimvis: through v0.2.0.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
  • CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
Impacted products
Vendor Product Version
misp bsimvis Affected: 0 , ≤ v0.2.0 (semver)
Create a notification for this product.
Credits
Thomas Caillet Alexandre Dulaunoy Codex GPT-5.5
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "bsimvis",
          "repo": "https://github.com/MISP/bsimvis",
          "vendor": "misp",
          "versions": [
            {
              "lessThanOrEqual": "v0.2.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Thomas Caillet"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Alexandre Dulaunoy"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Codex GPT-5.5"
        }
      ],
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          "lang": "en",
          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eA stored cross-site scripting vulnerability existed in MISP\u0026nbsp;\u003cstrong\u003eBSimVis\u003c/strong\u003e tag rendering code. Several client-side rendering paths interpolated tag names, collection names, entity identifiers, cluster names, and tag metadata directly into HTML, HTML attributes, inline JavaScript event handlers, and CSS style values without context-appropriate escaping. The patch adds shared escaping helpers for HTML, attributes, JavaScript strings, and CSS color validation, then applies them across tag badges, tooltips, context menus, cluster cards, autocomplete suggestions, and dynamically inserted tag cards.\u003c/p\u003e\u003cp\u003eAn attacker able to create or influence stored tag or metadata values could inject a crafted payload that is later rendered in another user\u2019s browser. Successful exploitation could execute arbitrary JavaScript in the victim\u2019s session when they view affected BSimVis pages, potentially allowing the attacker to perform actions as the victim, read data available to the victim, or alter displayed application content.\u003cbr\u003e\u003cbr\u003e\u003c/p\u003e\u003cp\u003eThis issue affects MISP bsimvis: through v0.2.0.\u003c/p\u003e"
            }
          ],
          "value": "A stored cross-site scripting vulnerability existed in MISP\u00a0BSimVis tag rendering code. Several client-side rendering paths interpolated tag names, collection names, entity identifiers, cluster names, and tag metadata directly into HTML, HTML attributes, inline JavaScript event handlers, and CSS style values without context-appropriate escaping. The patch adds shared escaping helpers for HTML, attributes, JavaScript strings, and CSS color validation, then applies them across tag badges, tooltips, context menus, cluster cards, autocomplete suggestions, and dynamically inserted tag cards.\n\nAn attacker able to create or influence stored tag or metadata values could inject a crafted payload that is later rendered in another user\u2019s browser. Successful exploitation could execute arbitrary JavaScript in the victim\u2019s session when they view affected BSimVis pages, potentially allowing the attacker to perform actions as the victim, read data available to the victim, or alter displayed application content.\n\n\n\nThis issue affects MISP bsimvis: through v0.2.0."
        }
      ],
      "impacts": [
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          "capecId": "CAPEC-18",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-18 XSS Targeting Non-Script Elements"
            }
          ]
        },
        {
          "capecId": "CAPEC-243",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-243 XSS Targeting HTML Attributes"
            }
          ]
        },
        {
          "capecId": "CAPEC-63",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-63 Cross-Site Scripting (XSS)"
            }
          ]
        },
        {
          "capecId": "CAPEC-592",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-592 Stored XSS"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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              "value": "GENERAL"
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or \u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-116",
              "description": "CWE-116 Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "orgId": "00000000-0000-4000-9000-000000000000"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/MISP/bsimvis/commit/7bcd2c2e27647dccdfb71877e905fbb032124a63"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "MISP BSimVis stored cross-site scripting in tag and cluster rendering paths via unescaped tag metadata and UI labels",
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  "cveMetadata": {
    "assignerOrgId": "00000000-0000-4000-9000-000000000000",
    "cveId": "CVE-2026-53693",
    "datePublished": "2026-06-10T14:32:00.000Z",
    "dateReserved": "2026-06-10T14:33:00.000Z",
    "dateUpdated": "2026-06-10T14:34:44.233807Z",
    "requesterUserId": "00000000-0000-4000-9000-000000000000",
    "serial": 1,
    "state": "PUBLISHED",
    "vulnId": "gcve-1-2026-20021"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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