How severe is CVE-2019-20102?

CVE-2019-20102 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-20102 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20102?

CVE-2019-20102 affects Atlassian Confluence Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20102?

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

When was CVE-2019-20102 published?

CVE-2019-20102 was published on 2020-04-22 and last updated on 2026-06-17.

CVE-2019-20102

CVE-2019-20102 is a medium-severity vulnerability in Atlassian Confluence Server with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Atlassian Confluence Server
Published: 2020-04-22
Last modified: 2026-06-17

Description

The attachment-uploading feature in Atlassian Confluence Server from version 6.14.0 through version 6.14.3, and version 6.15.0 before version 6.15.5 allows remote attackers to achieve stored cross-site- scripting (SXSS) via a malicious attachment with a modified `mimeType` parameter.

Frequently asked questions

What is CVE-2019-20102?: The attachment-uploading feature in Atlassian Confluence Server from version 6.14.0 through version 6.14.3, and version 6.15.0 before version 6.15.5 allows remote attackers to achieve stored cross-site- scripting (SXSS) via a malicious attachment with a modified `mimeType` parameter.
How severe is CVE-2019-20102?: CVE-2019-20102 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-20102 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20102?: CVE-2019-20102 affects Atlassian Confluence Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20102?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-20102 published?: CVE-2019-20102 was published on 2020-04-22 and last updated on 2026-06-17.

References

https://jira.atlassian.com/browse/CONFSERVER-59358

Affected products (1)

cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*

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