CVE-2026-86516Network attack vector

AWS resource access via overprivileged OIDC role

Published Sep 8, 2026 · Updated Sep 8, 2026

Incorrect privilege assignment in MockNest Serverless 0.9.0 allows remote authenticated users to gain broad AWS deployment privileges. The github-oidc-role.yaml template trusts multiple GitHub branch subjects with StringLike and attaches PowerUserAccess to the OIDC role. Control of an accepted GitHub Actions identity is required; the role permits reading, changing, or interrupting resources in the deployment account.

CVSS severity5.1
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect privilege assignment in MockNest Serverless 0.9.0 allows remote authenticated users to gain broad AWS deployment privileges. The github-oidc-role.yaml template trusts multiple GitHub branch subjects with StringLike and attaches PowerUserAccess to the OIDC role. Control of an accepted GitHub Actions identity is required; the role permits reading, changing, or interrupting resources in the deployment account.

The record

CVE
CVE-2026-86516
Published
Sep 8, 2026
Updated
Sep 8, 2026
Vendor
Elena van Engelen-Maslova
Product
MockNest Serverless
Classifications
CWE-269, CWE-266, T1078.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=0.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Elena van Engelen-Maslova · MockNest Serverlessversion=0.9.0

Published CVSS scores

4.7VulDB CNACVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C
5.1VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
4.7VulDB CNACVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C
5.8VulDB CNAAV:N/AC:L/Au:M/C:P/I:P/A:P/E:ND/RL:OF/RC:C

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-266Incorrect Privilege Assignment
T1078.004Valid Accounts: Cloud Accounts

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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