Vulnerability-Lookup

CVE-2026-35212 (GCVE-0-2026-35212)

Vulnerability from cvelistv5 – Published: 2026-06-02 21:28 – Updated: 2026-06-03 14:23

Title

OpenCTI has XSS in the rendering of email-message observable body data

Summary

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Versions prior to 7.260227.0 are vulnerable to XSS in the rendering of email-message observable body data. The content of the body field isn't appropriately sanitized when being rendered. Does require user interaction but could be exploited by someone sharing stix or any of the ingester. This could lead to CSRF and then large scale session theft. Version 7.260227.0 contains a fix.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

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

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/OpenCTI-Platform/opencti/secur…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
OpenCTI-Platform	opencti	Affected: < 7.260227.0

Show details on NVD website

JSON

To clipboard

{
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                "id": "CVE-2026-35212",
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                  },
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-03T14:22:56.163313Z",
                "version": "2.0.3"
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        }
      ],
      "metrics": [
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            "attackVector": "NETWORK",
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            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
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            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
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      "problemTypes": [
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          "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-rg6r-x26x-63vq"
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      "source": {
        "advisory": "GHSA-rg6r-x26x-63vq",
        "discovery": "UNKNOWN"
      },
      "title": "OpenCTI has XSS in the rendering of email-message observable body data"
    }
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    "vulnrichment": {
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FKIE_CVE-2026-35212

Vulnerability from fkie_nvd - Published: 2026-06-02 22:16 - Updated: 2026-06-02 22:16

Severity

5.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-rg6r-x26x-63vq

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Versions prior to 7.260227.0 are vulnerable to XSS in the rendering of email-message observable body data. The content of the body field isn\u0027t appropriately sanitized when being rendered. Does require user interaction but could be exploited by someone sharing stix or any of the ingester. This could lead to CSRF and then large scale session theft. Version 7.260227.0 contains a fix."
    }
  ],
  "id": "CVE-2026-35212",
  "lastModified": "2026-06-02T22:16:16.727",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-06-02T22:16:16.727",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-rg6r-x26x-63vq"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

WID-SEC-W-2026-1757

Vulnerability from csaf_certbund - Published: 2026-05-31 22:00 - Updated: 2026-06-02 22:00

Summary

OpenCTI: Schwachstelle ermöglicht Cross-Site Scripting

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: OpenCTI ist eine Open-Source-Plattform für Organisationen zur Verwaltung ihres Wissens und ihrer Beobachtungen im Bereich Cyber Threat Intelligence.

Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in OpenCTI ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

Betroffene Betriebssysteme: - Linux

CVE-2026-35212

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source OpenCTI <7.260227.0 Open Source / OpenCTI		<7.260227.0

References

3 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/OpenCTI-Platform/opencti/secur…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "OpenCTI ist eine Open-Source-Plattform f\u00fcr Organisationen zur Verwaltung ihres Wissens und ihrer Beobachtungen im Bereich Cyber Threat Intelligence.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in OpenCTI ausnutzen, um einen Cross-Site Scripting Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1757 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1757.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1757 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1757"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-rg6r-x26x-63vq vom 2026-06-01",
        "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-rg6r-x26x-63vq"
      }
    ],
    "source_lang": "en-US",
    "title": "OpenCTI: Schwachstelle erm\u00f6glicht Cross-Site Scripting",
    "tracking": {
      "current_release_date": "2026-06-02T22:00:00.000+00:00",
      "generator": {
        "date": "2026-06-03T06:02:59.548+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1757",
      "initial_release_date": "2026-05-31T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-31T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-06-02T22:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-34035"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c7.260227.0",
                "product": {
                  "name": "Open Source OpenCTI \u003c7.260227.0",
                  "product_id": "CA420E23-2A1B-459D-8562-37A34EB4D4A8"
                }
              },
              {
                "category": "product_version",
                "name": "7.260227.0",
                "product": {
                  "name": "Open Source OpenCTI 7.260227.0",
                  "product_id": "CA420E23-2A1B-459D-8562-37A34EB4D4A8-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:citeum:opencti:7.260227.0"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "OpenCTI"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-35212",
      "product_status": {
        "known_affected": [
          "CA420E23-2A1B-459D-8562-37A34EB4D4A8"
        ]
      },
      "release_date": "2026-05-31T22:00:00.000+00:00",
      "title": "CVE-2026-35212"
    }
  ]
}

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.

Action not permitted

CVE-2026-35212 (GCVE-0-2026-35212)

FKIE_CVE-2026-35212

WID-SEC-W-2026-1757

Tags

Sightings

Nomenclature