CVE-2026-55547Public exploitNetwork attack vector

Security configuration disclosure via missing IAM authorization

Published Aug 28, 2026 · Updated Aug 28, 2026

Missing authorization in Yamcs before 5.12.8 and 5.13.0 through 5.13.1 allows remote authenticated users to read IAM security metadata. IamApi.listRoles, IamApi.getRole, and IamApi.listPrivileges return role mappings and system privileges without checking ControlAccess. Any authenticated account can reach the endpoints, exposing configuration that supports targeted privilege-escalation attempts.

CVSS severity4.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Yamcs before 5.12.8 and 5.13.0 through 5.13.1 allows remote authenticated users to read IAM security metadata. IamApi.listRoles, IamApi.getRole, and IamApi.listPrivileges return role mappings and system privileges without checking ControlAccess. Any authenticated account can reach the endpoints, exposing configuration that supports targeted privilege-escalation attempts.

The record

CVE
CVE-2026-55547
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Space Applications Services
Product
Yamcs
Classifications
CWE-862, CWE-285, T1069
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=< 5.12.8
  2. Affected versionversion=>= 5.13.0, < 5.13.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Space Applications Services · Yamcsversion=< 5.12.8; version=>= 5.13.0, < 5.13.2

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-285Improper Authorization
T1069Permission Groups Discovery

Public exploit references

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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