What’s Vulnerable › Vulnerabilities

CVE-2021-31158

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-19 · updated 2026-06-17
• Weakness: CWE-863

Description

In the Query Engine in Couchbase Server 6.5.x and 6.6.x through 6.6.1, Common Table Expression queries were not correctly checking the user's permissions, allowing read-access to resources beyond what those users were explicitly allowed to access.

Affected products

• Couchbase Server: from 6.5.0 before 6.6.2 — fixed in 6.6.2

How to fix

Upgrade to a fixed version: Couchbase Server 6.6.2. Check the vendor advisory for mitigations.

References

• https://docs.couchbase.com/server/current/release-notes/relnotes.html
• https://www.couchbase.com/resources/security#SecurityAlerts
• https://docs.couchbase.com/server/current/release-notes/relnotes.html
• https://www.couchbase.com/resources/security#SecurityAlerts

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