Security readout for executives and security teams
Plain-English summary
This flaw lets a remote attacker inject HTML or JavaScript into a vulnerable Jira page after convincing a user to visit a malicious website. The main business risk is browser-side compromise of Jira users, including possible phishing, session abuse, or misleading content inside trusted Jira context.
Executive priority
Handle as a near-term Jira hygiene issue, not a confirmed emergency. Raise priority if vulnerable Jira instances are internet-accessible, used by privileged staff, or hold sensitive project and operational data.
Technical view
CVE-2021-43942 is a reflected XSS issue in Atlassian Jira Server and Data Center at /rest/collectors/1.0/template/custom. Affected ranges are versions before 8.13.15 and 8.14.0 through before 8.20.3. The source bundle provides no CVSS, CWE, or confirmed exploitation evidence.
Likely exposure
Organizations running Jira Server or Jira Data Center in the listed affected ranges are potentially exposed, especially where Jira is reachable by users through browsers. Exposure depends on deployed version and whether users can be lured to attacker-controlled content.
Exploitation context
The source says exploitation requires tricking a user into visiting a malicious website. The CVE is not listed as KEV in the provided bundle, and no cited source confirms active exploitation. Treat exploit status as unconfirmed.
Researcher notes
Evidence is limited to the CVE description and Atlassian tracker reference. No CVSS, CWE, exploit-in-the-wild confirmation, or detailed patch notes are included in the supplied bundle. Validate primarily by product, version range, and vendor guidance.
Mitigation direction
- Upgrade Jira Server/Data Center to a non-affected version: 8.13.15, 8.20.3, or later.
- Review Atlassian issue JRASERVER-73068 for vendor-specific remediation guidance.
- Prioritize externally reachable Jira instances and instances used by administrators.
- Reduce unnecessary internet exposure to Jira while remediation is pending.
Validation and detection
- Inventory all Jira Server and Data Center versions.
- Flag versions before 8.13.15 and 8.14.0 through before 8.20.3.
- Confirm whether Jira is reachable from untrusted networks.
- Review web access logs for unusual requests to /rest/collectors/1.0/template/custom.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-43942 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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-73068CVE 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.