CVE-2026-55548 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-55548MEDIUM

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  L  N  N    4.3   .0025   16.3     —

AFFECTED
  Product  Versions    Fixed
  yamcs    < 5.12.8 –  —

TIMELINE
  Jun 16  Reserved by GitHub_M
  Jul 16  EXPLOIT PUBLISHED — CVE-2026-55548 (yamcs). Public exploit reference added.
  Jul 16  Published (CNA: GitHub_M)

CWE-284, CWE-862 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 16, 2026	Reserved	Reserved by GitHub_M
July 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55548 (yamcs). Public exploit reference added.
July 16, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
yamcs	yamcs	—	< 5.12.8	—

Weaknesses

CWE-284 · CWE-862

References (5)

https://github.com/yamcs/yamcs/commit/b566beceba98cc35514b0e1519be126b8c5a0438 [Patch]
https://github.com/yamcs/yamcs/commit/c743cc3acf5b5c53ff5181b94eacc21340f70dd9 [Patch]
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8 [Release Notes]
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2 [Release Notes]
https://github.com/yamcs/yamcs/security/advisories/GHSA-8xjq-pr36-ccgf [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-55548 at cve.org

Vendors: yamcs

Weaknesses: CWE-284 · CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55548 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.