Security readout for executives and security teams
Plain-English summary
CVE-2018-20824 is a cross-site scripting issue in Atlassian Jira before 7.13.1. A remote attacker could inject HTML or JavaScript through the WallboardServlet cyclePeriod parameter, potentially affecting users who view the vulnerable page. The source bundle does not provide a CVSS score or evidence of active exploitation.
Executive priority
Treat this as a near-term hygiene fix, especially for exposed Jira systems. The issue can affect user trust and session security, but the source bundle lacks severity scoring or active exploitation evidence.
Technical view
The vulnerability is an XSS flaw in Jira WallboardServlet handling of the cyclePeriod parameter. The provided description states affected Jira versions are before 7.13.1. Technical detail is limited: no CVSS vector, CWE, authentication requirement, persistence behavior, or exploit preconditions are included in the supplied sources.
Likely exposure
Exposure is most likely in self-managed Jira deployments running versions earlier than 7.13.1 where the WallboardServlet resource is reachable by users or external traffic.
Exploitation context
The bundle says remote attackers can inject arbitrary HTML or JavaScript. It does not cite CISA KEV inclusion, public exploitation, exploit maturity, or exploitation in the wild.
Researcher notes
Evidence is narrow and source-grounded to the CVE description and Atlassian reference. Avoid assuming affected editions, authentication state, stored versus reflected behavior, or browser impact beyond XSS unless confirmed from vendor material.
Mitigation direction
- Upgrade Jira to version 7.13.1 or later.
- Review Atlassian issue JRASERVER-69238 for vendor-specific guidance.
- Restrict external access to Jira where business use allows.
- Prioritize remediation for internet-facing or broadly accessible Jira instances.
Validation and detection
- Inventory Jira instances and confirm exact versions.
- Identify any deployment running a version before 7.13.1.
- Confirm whether WallboardServlet is reachable from untrusted networks.
- Review web logs for unusual WallboardServlet requests involving cyclePeriod.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2018-20824 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://jira.atlassian.com/browse/JRASERVER-69238CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.