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TI-2026-40093 Aliases CVE-2026-55548GHSA-8xjq-pr36-ccgf

Yamcs: Insecure Direct Object Reference (IDOR) in PacketsApi allows unprivileged users to dump all telemetry packets

Priority MEDIUM 53CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, the PacketsApi.exportPackets endpoint in yamcs-core/src/main/java/org/yamcs/http/api/PacketsApi.java failed to enforce object-level ReadPacket privileges when a request omitted specific packet names: with an empty name list the ctx.checkObjectPrivileges(ObjectPrivilegeType.ReadPacket, nameSet) call passed over an empty set, no WHERE pname IN filter was applied to the resulting SELECT * FROM tm query, and the onTuple handler streamed every retrieved packet without any per-row authorization check, so a low-privileged or zero-privilege authenticated user could dump the entire raw telemetry packet archive and bypass the role-based access control model. This issue is fixed in versions 5.12.8 and 5.13.2, which enforce per-packet ReadPacket checks in exportPackets.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0036 30th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed yamcs (yamcs): 5.12.8, 5.13.2org.yamcs:yamcs-core (Maven): 5.13.2, 5.12.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
yamcsyamcsbefore 5.12.8; 5.13.0 to before 5.13.25.12.8, 5.13.2Patch availableCNA
—org.yamcs:yamcs-core (Maven)5.13.0 to before 5.13.25.13.2Patch availableGHSA-8xjq-pr36-ccgf
—org.yamcs:yamcs-core (Maven)before 5.12.85.12.8Patch availableGHSA-8xjq-pr36-ccgf
  • yamcs Vendoryamcs Affected before 5.12.8; 5.13.0 to before 5.13.2 Fixed in 5.12.8, 5.13.2 Patch available CNA
  • org.yamcs:yamcs-core (Maven) Vendor— Affected 5.13.0 to before 5.13.2 Fixed in 5.13.2 Patch available GHSA-8xjq-pr36-ccgf
  • org.yamcs:yamcs-core (Maven) Vendor— Affected before 5.12.8 Fixed in 5.12.8 Patch available GHSA-8xjq-pr36-ccgf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:*before 5.12.8; 5.13.0 to before 5.13.2Vulnerableyamcs
  • cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:* Versions before 5.12.8; 5.13.0 to before 5.13.2 Vulnerable ·yamcs

Remediation

  • Fix · CNA yamcs (yamcs) Fixed in 5.12.8, 5.13.2
  • Fix · GHSA-8xjq-pr36-ccgf org.yamcs:yamcs-core (Maven) Fixed in 5.13.2 Advisory →
  • Fix · GHSA-8xjq-pr36-ccgf org.yamcs:yamcs-core (Maven) Fixed in 5.12.8 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55548
  2. 2026-10-03 Alias added: GHSA-8xjq-pr36-ccgf

References

Exploit 1

Patch 2

Advisory 1

Other 3

  • TI-2026-34240 Yamcs: Remote Code Execution via Mission Database algorithm override CVSS 3.1CRITICAL 9.8
  • TI-2026-32507 Yamcs: No Rate Limiting on Authentication Endpoint CVSS 3.1CRITICAL 9.8
  • TI-2026-34277 Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection CVSS 3.1CRITICAL 9.1
  • TI-2026-32532 Yamcs: Server-Side Code Injection (RCE) via Janino Expression Engine in `JavaExprAlgorithmExecutionFactory` CVSS 3.1CRITICAL 9.1
  • TI-2026-32506 Yamcs: Unauthorized user enumeration via IAM API endpoints CVSS 3.1MEDIUM 4.3
  • TI-2023-24268 Directory Traversal vulnerability in the storage functionality of the API in Yamcs 5.8.6… CVSS 3.1CRITICAL 9.1
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences