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PatchSiren cyber security CVE debrief

CVE-2026-77810 AWS CVE debrief

The Neptune connector vulnerability, tracked as CVE-2026-77810, is a critical security issue that allows users with access to Neptune through Athena Federated Query to gain unauthorized access to properties in the Lambda supplying the compute for the connector. This vulnerability has a CVSS score of 9.4 and requires immediate attention. The affected product is the Neptune connector, and the vulnerability class is related to unauthorized access. The likely operational impact is high, and the source-confidence limits are based on the CVE record and NVD detail. To address this issue, users should verify their configurations and upgrade to aws-athena-query-federation v2026.30.1 or later.

Vendor
AWS
Product
Athena Federated Query Neptune Connector
CVSS
CRITICAL 9.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-21
Original CVE updated
2026-08-21
Advisory published
2026-08-21
Advisory updated
2026-08-21

Who should care

Users of the Neptune connector through Athena Federated Query, administrators of AWS environments, and security teams responsible for monitoring and mitigating vulnerabilities should be aware of this critical vulnerability. The affected operators include users of the Neptune connector, and the platform impact is high. The vulnerability-management impact is also high, as users need to verify their configurations and upgrade to the latest version of aws-athena-query-federation. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The Neptune connector vulnerability, CVE-2026-77810, allows users with access to Neptune through Athena Federated Query to gain unauthorized access to properties in the Lambda supplying the compute for the connector. This critical vulnerability has a CVSS score of 9.4 and requires immediate attention. The affected product is the Neptune connector, and the defensive impact is high. The source-grounded technical framing indicates that the vulnerability is related to the Neptune connector's interaction with Athena Federated Query. To mitigate this issue, users should upgrade to aws-athena-query-federation v2026.30.1 or later and verify their configurations for potential unauthorized access.

Defensive priority

Users of the Neptune connector through Athena Federated Query should verify their configurations and upgrade to aws-athena-query-federation v2026.30.1 or later to mitigate potential unauthorized access.

Recommended defensive actions

  • Upgrade to aws-athena-query-federation v2026.30.1 or later
  • Verify configurations for potential unauthorized access
  • Monitor for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE-2026-77810 record indicates a critical vulnerability in the Neptune connector, allowing users with access to Neptune through Athena Federated Query to gain unauthorized access to properties in the Lambda supplying the compute for the connector. The vendor, Amazon, has provided a remediation by upgrading to aws-athena-query-federation v2026.30.1 or later.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-21T20:16:45.530Z and has not been modified since then.