CVE-2026-35210 (GCVE-0-2026-35210)

Vulnerability from cvelistv5 – Published: 2026-07-08 21:06 – Updated: 2026-07-08 21:06
VLAI
Title
OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection
Summary
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 7.260326.0, an authorization bypass vulnerability in OpenCTI allows any authenticated user with KNOWLEDGE_KNUPDATE permission to bypass Confidence Level validation and Object Marking restrictions by injecting the synchronized-upsert: true HTTP header, enabling attackers to downgrade confidence levels, remove security markings such as TLP:RED, manipulate relationships, and affect STIX object types including Indicators, ThreatActors, Malware, and Reports. This issue is fixed in version 7.260326.0.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version
OpenCTI-Platform opencti Affected: < 7.260326.0
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        }
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              "description": "CWE-863: Incorrect Authorization",
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      "providerMetadata": {
        "dateUpdated": "2026-07-08T21:06:02.349Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj",
          "tags": [
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          "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj"
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          "tags": [
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        },
        {
          "name": "https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0",
          "tags": [
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          "url": "https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0"
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      "source": {
        "advisory": "GHSA-36fr-4m54-94mj",
        "discovery": "UNKNOWN"
      },
      "title": "OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection"
    }
  },
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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "cveId": "CVE-2026-35210",
    "datePublished": "2026-07-08T21:06:02.349Z",
    "dateReserved": "2026-04-01T18:48:58.937Z",
    "dateUpdated": "2026-07-08T21:06:02.349Z",
    "state": "PUBLISHED"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.