How severe is CVE-2019-12866?

CVE-2019-12866 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-12866 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12866?

CVE-2019-12866 affects Jetbrains Youtrack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12866?

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

When was CVE-2019-12866 published?

CVE-2019-12866 was published on 2019-07-03 and last updated on 2026-06-17.

CVE-2019-12866

CVE-2019-12866 is a critical-severity vulnerability in Jetbrains Youtrack with a CVSS 3.x base score of 9.8. 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-639.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Jetbrains Youtrack
Published: 2019-07-03
Last modified: 2026-06-17

Description

An Insecure Direct Object Reference, with Authorization Bypass through a User-Controlled Key, was possible in JetBrains YouTrack. The issue was fixed in 2018.4.49168.

Frequently asked questions

What is CVE-2019-12866?: An Insecure Direct Object Reference, with Authorization Bypass through a User-Controlled Key, was possible in JetBrains YouTrack. The issue was fixed in 2018.4.49168.
How severe is CVE-2019-12866?: CVE-2019-12866 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-12866 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12866?: CVE-2019-12866 affects Jetbrains Youtrack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12866?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-12866 published?: CVE-2019-12866 was published on 2019-07-03 and last updated on 2026-06-17.

References

https://blog.jetbrains.com/blog/2019/06/19/jetbrains-security-bulletin-q1-2019/

Affected products (1)

cpe:2.3:a:jetbrains:youtrack:*:*:*:*:*:*:*:*

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