CVE-2026-100266: In JetBrains Hub before 2026.2.52366 missing authorisation allowed authenticated users to send arbitrary email

Q: How do I fix CVE-2026-100266?

hub: upgrade to 2026.2.52366. Exact commands for each OS are on this page.

Q: Is CVE-2026-100266 being exploited?

CVE-2026-100266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-100266 affect?

CVE-2026-100266 affects hub. Severity is high (CVSS 7.7). In JetBrains Hub before 2026.2.52366 missing authorisation allowed authenticated users to send arbitrary emails from the server's trusted address

Routine

HIGH 7.7UPGRADE

CVE-2026-100266 is a high-severity flaw (CVSS 7.7) affecting hub. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-09-30
Last modified	2026-10-02

Publisher (CNA): JetBrains s.r.o. · Vendor: jetbrains

Last updated 2026-10-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-30 16:16 UTCPublished CVE record published
2026-10-02 16:47 UTCUpdated Record last modified

jetbrains hub UPGRADE

Affected: < 2026.2.52366

Fixed in: 2026.2.52366

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hub || rpm -q hub || hub --version

2. UPGRADE to 2026.2.52366 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hub

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hub

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-100266?

hub: upgrade to 2026.2.52366. Exact commands for each OS are on this page.

Is CVE-2026-100266 being exploited?

CVE-2026-100266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-100266 affect?

CVE-2026-100266 affects hub. Severity is high (CVSS 7.7). In JetBrains Hub before 2026.2.52366 missing authorisation allowed authenticated users to send arbitrary emails from the server's trusted address

How urgent is CVE-2026-100266?

Priority 30/100. High severity

Related CVEs

CVE-2026-50242 CRITICAL 10.0 UPGRADE In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.14842
CVE-2026-56141 CRITICAL 9.8 UPGRADE In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.14842
CVE-2026-56142 CRITICAL 9.9 UPGRADE In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.14842

References

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