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CVE-2026-35210

HIGH
7.1
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-35210
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-04-01 18:48 UTC
Published
2026-07-08 21:06 UTC
Last updated
2026-07-09 13:45 UTC
Primary CWE
CWE-639
CWE-639: Authorization Bypass Through User-Controlled Key
Vendor / Product
OpenCTI-Platform / opencti
Sources
cve.org  ·  NVD

Severity & Metrics

7.1 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
OpenCTI-Platform opencti — < 7.260326.0
Weakness (CWE)
CWESourceDescription
CWE-639 cna CWE-639: Authorization Bypass Through User-Controlled Key
CWE-863 cna CWE-863: Incorrect Authorization
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.1 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
References (4)
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