🛡️ CVE-2026-35210 — opencti
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.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity high, availability none.
Weakness class
CVE-2026-35210 is classified as CWE-639: Authorization Bypass Through User-Controlled Key. An object is selected by an identifier from the request without checking the caller owns it.
Affected software
CVE-2026-35210 is recorded against 2 packages.
- opencti (fixed in 7.260326.0)
- pycti (fixed in 7.260326.0)
Timeline and source
Published on 8 July 2026 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.
References
Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| opencti | — | 7.260326.0 |
| pycti | — | 7.260326.0 |
References
Similar Threats
- Medium CVE-2026-35211
- Medium CVE-2026-35212
- High CVE-2026-44730
- Critical CVE-2026-27960
- Critical CVE-2026-39980
More CVE 2026 advisories
Browse all of CVE 2026 in the advisory index.
Site Security Check
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CVE-2026-35210 is rated CVSS 7.1 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.
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