How severe is CVE-2026-100266?

CVE-2026-100266 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-100266 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-100266?

CVE-2026-100266 affects Jetbrains Hub. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-100266?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-100266 published?

CVE-2026-100266 was published on 2026-09-30 and last updated on 2026-10-02.

CVE-2026-100266

CVE-2026-100266 is a high-severity vulnerability in Jetbrains Hub with a CVSS 3.x base score of 7.7. 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-862.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Jetbrains Hub
Published: 2026-09-30
Last modified: 2026-10-02

Description

In JetBrains Hub before 2026.2.52366 missing authorisation allowed authenticated users to send arbitrary emails from the server's trusted address

Frequently asked questions

What is CVE-2026-100266?: In JetBrains Hub before 2026.2.52366 missing authorisation allowed authenticated users to send arbitrary emails from the server's trusted address
How severe is CVE-2026-100266?: CVE-2026-100266 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-100266 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-100266?: CVE-2026-100266 affects Jetbrains Hub. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-100266?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-100266 published?: CVE-2026-100266 was published on 2026-09-30 and last updated on 2026-10-02.

References

https://www.jetbrains.com/privacy-security/issues-fixed/

Affected products (1)

cpe:2.3:a:jetbrains:hub:*:*:*:*:*:*:*:*

More vulnerabilities in Jetbrains Hub

CVE-2026-50242 — Critical (CVSS 10.0): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429…
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CVE-2026-56141 — Critical (CVSS 9.8): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429 account…
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CVE-2021-43183 — Critical (CVSS 9.8): In JetBrains Hub before 2021.1.13690, the authentication throttling mechanism could be bypassed.
CVE-2021-36209 — Critical (CVSS 9.8): In JetBrains Hub before 2021.1.13389, account takeover was possible during password reset.

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