Security readout for executives and security teams
Plain-English summary
This issue exposes a small piece of user behavior in affected Jira Server and Data Center deployments: which editor mode a user is using. It matters when an attacker can intercept traffic, because the cookie lacked the Secure attribute even when Jira used HTTPS.
Executive priority
Handle through normal patch governance unless the Jira instance is heavily used over untrusted networks. The business risk appears limited, but the issue is easy to fold into Jira maintenance.
Technical view
CVE-2021-26076 affects the jira.editor.user.mode cookie set by the Jira Editor Plugin in specified Jira Server and Data Center versions. A remote anonymous attacker with attacker-in-the-middle capability could observe the editor mode because the cookie was not marked Secure when Jira was configured for HTTPS.
Likely exposure
Exposure is likely limited to affected Jira Server or Jira Data Center versions with the Jira Editor Plugin, HTTPS configuration, and user traffic exposed to an attacker-in-the-middle scenario.
Exploitation context
The provided sources do not show CISA KEV listing, active exploitation, public exploit use, or broad compromise impact. The documented impact is disclosure of editor mode, not account takeover or code execution.
Researcher notes
Affected ranges are before 8.5.12, 8.6.0 before 8.13.4, and 8.14.0 before 8.15.0. Evidence is limited to the CVE record and Atlassian issue reference; no CVSS, CWE, or exploitation confirmation was provided.
Mitigation direction
- Upgrade affected Jira Server and Data Center instances to the fixed version for the installed release track.
- Review Atlassian JRASERVER-72252 for vendor-specific remediation guidance.
- Prioritize instances reachable by users over untrusted networks.
- Confirm HTTPS and cookie security settings after remediation.
Validation and detection
- Inventory Jira Server and Data Center versions against the affected ranges.
- Identify whether the Jira Editor Plugin is present on in-scope instances.
- In a controlled session, verify the jira.editor.user.mode cookie includes the Secure attribute.
- Check vulnerability management records for remediation to fixed Jira versions.
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-2021-26076 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-72252CVE 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.