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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 38.0%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.0
- 6.1 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 37.99% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- atlassian/jira
- Source
- security@atlassian.com
EPSS moved from 24.7% on 21 September 2026 to 38.0% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- https://jira.atlassian.com/browse/JRASERVER-69238Issue Tracking, Vendor Advisory
- https://jira.atlassian.com/browse/JRASERVER-69238Issue Tracking, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.