How severe is CVE-2018-20824?

CVE-2018-20824 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-2018-20824 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 38% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20824?

CVE-2018-20824 affects Atlassian Jira. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20824?

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

When was CVE-2018-20824 published?

CVE-2018-20824 was published on 2019-05-03 and last updated on 2026-06-17.

CVE-2018-20824

CVE-2018-20824 is a medium-severity vulnerability in Atlassian Jira with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 38% places it in the 98th percentile, indicating an elevated likelihood of exploitation. 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: 38% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Atlassian Jira
Published: 2019-05-03
Last modified: 2026-06-17

Description

The WallboardServlet resource in Jira before version 7.13.1 allows remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the cyclePeriod parameter.

Frequently asked questions

What is CVE-2018-20824?: The WallboardServlet resource in Jira before version 7.13.1 allows remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the cyclePeriod parameter.
How severe is CVE-2018-20824?: CVE-2018-20824 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-2018-20824 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 38% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20824?: CVE-2018-20824 affects Atlassian Jira. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20824?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20824 published?: CVE-2018-20824 was published on 2019-05-03 and last updated on 2026-06-17.

References

https://jira.atlassian.com/browse/JRASERVER-69238

Affected products (1)

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

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