Security readout for executives and security teams
Plain-English summary
This issue let some Couchbase Server users read data they were not explicitly permitted to access when using Common Table Expression queries. It is a confidentiality and authorization problem, not evidence of remote takeover from the supplied sources.
Executive priority
Treat as a targeted confidentiality risk for affected Couchbase deployments. Prioritize if sensitive data is stored in Couchbase or many users have query access.
Technical view
CVE-2021-31158 affects the Couchbase Server Query Engine in 6.5.x and 6.6.x through 6.6.1. CTE queries did not correctly enforce user permissions, allowing reads beyond assigned access. No CVSS, CWE, exploit details, or fixed version is provided in the supplied bundle.
Likely exposure
Exposure is likely limited to organizations running Couchbase Server 6.5.x or 6.6.x through 6.6.1 with users able to issue Query Engine CTE queries.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. Abuse would require some level of legitimate query access, based on the description.
Researcher notes
Evidence is sparse: no CVSS, CWE, exploit status, or explicit fixed version appears in the provided bundle. Analysis should stay anchored to the authorization bypass in CTE permission checks.
Mitigation direction
- Inventory Couchbase Server versions and identify 6.5.x or 6.6.x through 6.6.1 deployments.
- Check Couchbase security alerts and release notes for the vendor-confirmed fixed release.
- Apply vendor-recommended upgrades or mitigations once confirmed from Couchbase guidance.
- Limit Query Engine access to trusted users while remediation is being assessed.
Validation and detection
- Confirm whether any production or non-production systems run the affected Couchbase versions.
- Review which users or roles can issue Query Engine Common Table Expression queries.
- Verify least-privilege role assignments for buckets, scopes, collections, and query access.
- Use authorized testing to confirm restricted users cannot read unauthorized resources.
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-2021-31158 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://www.couchbase.com/resources/security#SecurityAlertsCVE reference · x_refsource_MISC
- https://docs.couchbase.com/server/current/release-notes/relnotes.htmlCVE 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.