How severe is CVE-2021-43188?

CVE-2021-43188 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2021-43188 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43188?

CVE-2021-43188 affects Jetbrains Youtrack Mobile. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43188?

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-2021-43188 published?

CVE-2021-43188 was published on 2021-11-09 and last updated on 2026-06-17.

CVE-2021-43188

CVE-2021-43188 is a high-severity vulnerability in Jetbrains Youtrack Mobile with a CVSS 3.x base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v2: 7.5
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jetbrains Youtrack Mobile
Published: 2021-11-09
Last modified: 2026-06-17

Description

In JetBrains YouTrack Mobile before 2021.2, access token protection on iOS is incomplete.

Frequently asked questions

What is CVE-2021-43188?: In JetBrains YouTrack Mobile before 2021.2, access token protection on iOS is incomplete.
How severe is CVE-2021-43188?: CVE-2021-43188 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2021-43188 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43188?: CVE-2021-43188 affects Jetbrains Youtrack Mobile. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43188?: 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-2021-43188 published?: CVE-2021-43188 was published on 2021-11-09 and last updated on 2026-06-17.

References

https://blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021/

Affected products (1)

cpe:2.3:a:jetbrains:youtrack_mobile:*:*:*:*:*:*:*:*

More vulnerabilities in Jetbrains Youtrack Mobile

CVE-2021-43189 — High (CVSS 7.3): In JetBrains YouTrack Mobile before 2021.2, access token protection on Android is incomplete.
CVE-2021-43192 — Medium (CVSS 5.3): In JetBrains YouTrack Mobile before 2021.2, iOS URL scheme hijacking is possible.
CVE-2021-43191 — Medium (CVSS 5.3): JetBrains YouTrack Mobile before 2021.2, is missing the security screen on Android and iOS.
CVE-2021-43190 — Medium (CVSS 5.3): In JetBrains YouTrack Mobile before 2021.2, task hijacking on Android is possible.
CVE-2021-43187 — Medium (CVSS 5.3): In JetBrains YouTrack Mobile before 2021.2, the client-side cache on iOS could contain sensitive information.

All CVEs affecting Jetbrains Youtrack Mobile →