Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.
https://hackread.com/androxgh0st-botnet-iot-devices-exploit-vulnerabilities/
https://hackread.com/androxgh0st-botnet-integrate-mozi-iot-vulnerabilities/
https://www.greynoise.io/blog/spike-in-atlassian-exploitation-attempts-patching-is-crucial
https://github.com/prafull97-lab/Cybersecurity-Vulnerability-Risk-Analysis
https://github.com/kang9693/PoC_cve_list
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26086
https://jira.atlassian.com/browse/JRASERVER-72695
http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html