CVE•Published 2026-08-11•Modified 2026-08-28•1 article on news•4 live references•NVD data
CVE-2026-18691
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
14
Exploit Prediction Scoring System · top 86% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2026-08-11
Modified 2026-08-28
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-18691Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-18691Censys host search filtered to this CVE id.
grep.app
CVE-2026-18691Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-18691GitHub code search for direct mentions.
Google dork
"CVE-2026-18691" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.