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BDVDB
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Vulnerabilities

CVE-2026-18691 | BDVDB-2026-357285 Detail

MongoDBMongoDB Server

Description#

An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to be transmitted in a less-protected form, potentially allowing that credential to be recovered. If recovered, the credential could be used to authenticate as the internal superuser to nodes in the deployment.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: adjacent.

Weaknesses#

  • CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.