CVE-2026-18691High· 8.8▾ TwilightAn 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, t…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
Last analysed / modified upstream
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.
mongodb >= 7.0.0, < 7.0.40mongodb >= 8.0.0, < 8.0.29mongodb >= 8.2.0, <= 8.2.12mongodb >= 8.3.0, < 8.3.8mongodb = 9.0.0mongodb = 9.1.0Upgrade past the affected range:
mongodb 8.3.8Connected by shared product, vendor, weakness, or advisory.
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