CVEvulnerability

CVE-2026-18691

9.0 CRITICAL Published 2026-08-11 Modified 2026-10-23 Official page ↗
Status
Analyzed
Published
2026-08-11
Last modified
2026-10-23
Assigner
[email protected]
CVSS 4.0 ([email protected])
9.0 CRITICAL — CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-757

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.

Affected configurations

• mongodb mongodb (>= 7.0.0 < 7.0.40) • mongodb mongodb (>= 8.0.0 < 8.0.29) • mongodb mongodb (>= 8.2.0 <= 8.2.12) • mongodb mongodb (>= 8.3.0 < 8.3.8) • mongodb mongodb 9.0.0 • mongodb mongodb 9.1.0

Related

Weakness · CWE (1)

  • CWE-757 Selection of Less-Secure Algorithm During Negotiation weakness

References