Vulnerability-Lookup

GHSA-CV7J-9Q69-FXH4

Vulnerability from github – Published: 2026-08-27 18:32 – Updated: 2026-08-27 18:32

Details

Affected versions of Flowintel construct timeline HTML using attacker-controllable MISP object fields such as:

object UUID;
object name;
attribute value;
attribute type;
comment;
first/last seen values;
IDS flag.

Those values were concatenated directly into HTML strings before rendering. The upstream commit explicitly states that DOMPurify removed XSS vectors but still allowed other HTML elements, such as forms, through.

The fix replaces direct string interpolation with DOM construction via document.createElement() and assigns all attacker-controlled values using textContent. The headline is similarly converted to escaped HTML through a temporary element.

Version impacted =>3.3.0

Severity

5.1 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-81820"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-27T17:21:05Z",
    "severity": "MODERATE"
  },
  "details": "Affected versions of Flowintel construct timeline HTML using attacker-controllable MISP object fields such as:\n\n\n\n  *  \nobject UUID;\n\n\n  *  \nobject name;\n\n\n  *  \nattribute value;\n\n\n  *  \nattribute type;\n\n\n  *  \ncomment;\n\n\n  *  \nfirst/last seen values;\n\n\n  *  \nIDS flag.\n\n\n\n\n\nThose values were concatenated directly into HTML strings before rendering. The upstream commit explicitly states that DOMPurify removed XSS vectors but still allowed other HTML elements, such as forms, through.\n\nThe fix replaces direct string interpolation with DOM construction via document.createElement() and assigns all attacker-controlled values using textContent. The headline is similarly converted to escaped HTML through a temporary element.\n\nVersion impacted =\u003e3.3.0",
  "id": "GHSA-cv7j-9q69-fxh4",
  "modified": "2026-08-27T18:32:30Z",
  "published": "2026-08-27T18:32:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81820"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flowintel/flowintel/commit/11f71e747d95ed062667e2df0ce259c5fa64d531.patch"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-81820 (GCVE-0-2026-81820)

Vulnerability from cvelistv5 – Published: 2026-08-27 13:25 – Updated: 2026-08-27 19:39

Title

Flowintel HTML Injection in MISP Case History Timeline via Crafted Object Attributes

Summary

Affected versions of Flowintel construct timeline HTML using attacker-controllable MISP object fields such as: * object UUID; * object name; * attribute value; * attribute type; * comment; * first/last seen values; * IDS flag. Those values were concatenated directly into HTML strings before rendering. The upstream commit explicitly states that DOMPurify removed XSS vectors but still allowed other HTML elements, such as forms, through. The fix replaces direct string interpolation with DOM construction via document.createElement() and assigns all attacker-controlled values using textContent. The headline is similarly converted to escaped HTML through a temporary element. Version impacted =>3.3.0

Severity

5.1 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 19:39 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Assigner

CIRCL ENISA root

References

1 reference

URL	Tags
https://github.com/flowintel/flowintel/commit/11f…	patch

Impacted products

1 product

Vendor	Product	Version
flowintel	flowintel	Affected: 0 , ≤ 3.3.0 (semver)

Credits

Jeroen Pinoy David Cruciani

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-81820",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-27T19:39:14.593497Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
          "dateUpdated": "2026-08-27T19:39:23.123Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "defaultStatus": "unaffected",
          "product": "flowintel",
          "repo": "https://github.com/flowintel/flowintel",
          "vendor": "flowintel",
          "versions": [
            {
              "lessThanOrEqual": "3.3.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Jeroen Pinoy"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "David Cruciani"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAffected versions of Flowintel construct timeline HTML using attacker-controllable MISP object fields such as:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\nobject UUID;\n\u003c/li\u003e\n\u003cli\u003e\nobject name;\n\u003c/li\u003e\n\u003cli\u003e\nattribute value;\n\u003c/li\u003e\n\u003cli\u003e\nattribute type;\n\u003c/li\u003e\n\u003cli\u003e\ncomment;\n\u003c/li\u003e\n\u003cli\u003e\nfirst/last seen values;\n\u003c/li\u003e\n\u003cli\u003e\nIDS flag.\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eThose values were concatenated directly into HTML strings before rendering. The upstream commit explicitly states that DOMPurify removed XSS vectors but still allowed other HTML elements, such as forms, through.\u003c/p\u003e\u003cp\u003eThe fix replaces direct string interpolation with DOM construction via \u003ccode\u003edocument.createElement()\u003c/code\u003e and assigns all attacker-controlled values using \u003ccode\u003etextContent\u003c/code\u003e. The headline is similarly converted to escaped HTML through a temporary element.\u003c/p\u003eVersion impacted =\u0026gt;3.3.0"
            }
          ],
          "value": "Affected versions of Flowintel construct timeline HTML using attacker-controllable MISP object fields such as:\n\n\n\n  *  \nobject UUID;\n\n\n  *  \nobject name;\n\n\n  *  \nattribute value;\n\n\n  *  \nattribute type;\n\n\n  *  \ncomment;\n\n\n  *  \nfirst/last seen values;\n\n\n  *  \nIDS flag.\n\n\n\n\n\nThose values were concatenated directly into HTML strings before rendering. The upstream commit explicitly states that DOMPurify removed XSS vectors but still allowed other HTML elements, such as forms, through.\n\nThe fix replaces direct string interpolation with DOM construction via document.createElement() and assigns all attacker-controlled values using textContent. The headline is similarly converted to escaped HTML through a temporary element.\n\nVersion impacted =\u003e3.3.0"
        }
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            "Recovery": "NOT_DEFINED",
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            "attackRequirements": "NONE",
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            "providerUrgency": "NOT_DEFINED",
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            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or \u0027Cross-site Scripting\u0027)",
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        "dateUpdated": "2026-08-27T13:25:08.712Z",
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          "url": "https://github.com/flowintel/flowintel/commit/11f71e747d95ed062667e2df0ce259c5fa64d531.patch"
        }
      ],
      "source": {
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      },
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  "cveMetadata": {
    "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
    "assignerShortName": "CIRCL",
    "cveId": "CVE-2026-81820",
    "datePublished": "2026-08-27T13:25:08.712Z",
    "dateReserved": "2026-08-27T13:25:06.878Z",
    "dateUpdated": "2026-08-27T19:39:23.123Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-CV7J-9Q69-FXH4

CVE-2026-81820 (GCVE-0-2026-81820)

Tags

Sightings

Nomenclature