How severe is CVE-2019-12156?

CVE-2019-12156 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2019-12156 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12156?

CVE-2019-12156 affects Jetbrains Upsource. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12156?

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

When was CVE-2019-12156 published?

CVE-2019-12156 was published on 2019-10-02 and last updated on 2026-06-17.

CVE-2019-12156

CVE-2019-12156 is a medium-severity vulnerability in Jetbrains Upsource with a CVSS 3.x base score of 5.3. 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-209.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-209
Affected product: Jetbrains Upsource
Published: 2019-10-02
Last modified: 2026-06-17

Description

Server metadata could be exposed because one of the error messages reflected the whole response back to the client in JetBrains TeamCity versions before 2018.2.5 and UpSource versions before 2018.2 build 1293.

Frequently asked questions

What is CVE-2019-12156?: Server metadata could be exposed because one of the error messages reflected the whole response back to the client in JetBrains TeamCity versions before 2018.2.5 and UpSource versions before 2018.2 build 1293.
How severe is CVE-2019-12156?: CVE-2019-12156 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2019-12156 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12156?: CVE-2019-12156 affects Jetbrains Upsource. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12156?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-12156 published?: CVE-2019-12156 was published on 2019-10-02 and last updated on 2026-06-17.

References

https://blog.jetbrains.com/blog/2019/09/26/jetbrains-security-bulletin-q2-2019/

Affected products (1)

cpe:2.3:a:jetbrains:upsource:*:*:*:*:*:*:*:*

More vulnerabilities in Jetbrains Upsource

CVE-2019-12157 — Critical (CVSS 9.8): In JetBrains UpSource versions before 2018.2 build 1293, there is credential disclosure via RPC commands.
CVE-2021-30482 — High (CVSS 7.5): In JetBrains UpSource before 2020.1.1883, application passwords were not revoked correctly
CVE-2019-19704 — High (CVSS 7.5): In JetBrains Upsource before 2020.1, information disclosure is possible because of an incorrect user matching algorithm.
CVE-2019-14961 — Medium (CVSS 6.1): JetBrains Upsource before 2019.1.1412 was not properly escaping HTML tags in a code block comments, leading to XSS.

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