How severe is CVE-2019-8449?

CVE-2019-8449 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-2019-8449 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 85% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-8449?

CVE-2019-8449 affects Atlassian Jira. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-8449?

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

When was CVE-2019-8449 published?

CVE-2019-8449 was published on 2019-09-11 and last updated on 2026-06-17.

CVE-2019-8449

CVE-2019-8449 is a medium-severity vulnerability in Atlassian Jira with a CVSS 3.x base score of 5.3. Its EPSS exploit-prediction score of 85% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-306.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 85% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Atlassian Jira
Published: 2019-09-11
Last modified: 2026-06-17

Description

The /rest/api/latest/groupuserpicker resource in Jira before version 8.4.0 allows remote attackers to enumerate usernames via an information disclosure vulnerability.

Frequently asked questions

What is CVE-2019-8449?: The /rest/api/latest/groupuserpicker resource in Jira before version 8.4.0 allows remote attackers to enumerate usernames via an information disclosure vulnerability.
How severe is CVE-2019-8449?: CVE-2019-8449 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-2019-8449 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 85% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-8449?: CVE-2019-8449 affects Atlassian Jira. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-8449?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-8449 published?: CVE-2019-8449 was published on 2019-09-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:atlassian:jira:*:*:*:*:*:*:*:*

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