CVE-2026-6915Network attack vector

Authenticated cross-account downgrade via unchecked updateUser command

Published Apr 29, 2026 · Updated Apr 29, 2026

Improper authorization in MongoDB Server 7.0, 8.0, and 8.2 allows remote authenticated users to downgrade another account's authentication. The updateUser command omits an authorization check before changing another user's mechanism from SCRAM-SHA-256 to SCRAM-SHA-1. Affected releases are 7.0.0 through 7.0.31, 8.0.0 through 8.0.20, and 8.2.0 through 8.2.6; any authenticated account can make the cross-account change.

CVSS severity5.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in MongoDB Server 7.0, 8.0, and 8.2 allows remote authenticated users to downgrade another account's authentication. The updateUser command omits an authorization check before changing another user's mechanism from SCRAM-SHA-256 to SCRAM-SHA-1. Affected releases are 7.0.0 through 7.0.31, 8.0.0 through 8.0.20, and 8.2.0 through 8.2.6; any authenticated account can make the cross-account change.

The record

CVE
CVE-2026-6915
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
MongoDB
Product
MongoDB Server
Classifications
CWE-1284, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.0 <7.0.32
  2. Affected versionversion=8.0.0 <8.0.21
  3. Affected versionversion=8.2.0 <8.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MongoDB · MongoDB Serverversion=7.0.0 <7.0.32; version=8.0.0 <8.0.21; version=8.2.0 <8.2.7

Published CVSS scores

6.3MongoDB, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.3MongoDB, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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