Yamcs: DOM XSS in Extension Routing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55566
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 20:18:29 UTC
Updated2026-09-08 21:08:37 UTC
DescriptionYamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs processes attacker-controlled data from the /ext URL route in yamcs-web/src/main/webapp/projects/webapp/src/app/core/routes/extension.matcher.ts, extension.component.ts, and app.component.ts without checking registered plugin IDs before DOM rendering through innerHTML. A crafted URL can execute JavaScript when opened by a user. The script can read data available to the Yamcs web application and perform actions in the user context. This issue is fixed in versions 5.12.8 and 5.13.2.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS: 0.002740000 probability, percentile 0.195040000 (date 2026-09-08)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Yamcs Yamcs affected < 5.12.8 Not specified
CNA Yamcs Yamcs affected >= 5.13.0, < 5.13.2 Not specified

References

ReferenceSourceLinkTags
github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2 [email protected] github.com
github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8 [email protected] github.com
github.com/yamcs/yamcs/commit/ecf34a4e2ccbe085e6ceff0253595b24d5ecb4aa [email protected] github.com
github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297 [email protected] github.com
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