How severe is CVE-2026-35212?

CVE-2026-35212 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-35212 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35212?

CVE-2026-35212 affects Citeum Opencti. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35212?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35212 have an EU (EUVD) identifier?

Yes. CVE-2026-35212 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34035.

When was CVE-2026-35212 published?

CVE-2026-35212 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-35212

CVE-2026-35212 is a medium-severity vulnerability in Citeum Opencti with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34035
Weakness: CWE-79
Affected product: Citeum Opencti
Published: 2026-06-02
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-35212?: 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.
How severe is CVE-2026-35212?: CVE-2026-35212 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-35212 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35212?: CVE-2026-35212 affects Citeum Opencti. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35212?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35212 have an EU (EUVD) identifier?: Yes. CVE-2026-35212 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34035.
When was CVE-2026-35212 published?: CVE-2026-35212 was published on 2026-06-02 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*

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