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MEDIUM severity

Yamcs Cross-site Scripting vulnerabilityGHSA-643f-hpcc-2gv8

MEDIUM

GHSA-643f-hpcc-2gv8 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in org.yamcs:yamcs. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for org.yamcs:yamcs — see the affected versions and patch details below.

Also known asCVE-2023-45280
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 28, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk+0.07%
Lower risk than most CVEs49th percentile — riskier than 49% of all scored CVEsHighest risk
0.03%0.78%1.53%2.28%1.8%0.6%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.yamcs:yamcs

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Yamcs 5.8.6 allows XSS (issue 2 of 2). It comes with a Bucket as its primary storage mechanism. Buckets allow for the upload of any file. There's a way to upload an HTML file containing arbitrary JavaScript and then navigate to it. Once the user opens the file, the browser will execute the arbitrary JavaScript.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.yamcs:yamcsall versions5.8.7org.yamcs:yamcs:5.8.7

Affected Products

1 product · 1 configurations
Application
yamcsspaceapplications
1 version
5.8.6
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Yamcs 5.8.6 allows XSS (issue 2 of 2). It comes with a Bucket as its pri…

linkedin.comNVDOct 2023

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.yamcs:yamcs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.yamcs:yamcs to 5.8.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-643f-hpcc-2gv8 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Yamcs 5.8.6 allows XSS (issue 2 of 2). It comes with a Bucket as its primary storage mechanism. Buckets allow for the upload of any file. There's a way to upload an HTML file containing arbitrary JavaScript and then navigate to it. Once the user opens the file, the browser will execute the arbitrary JavaScript.
O3 Security · Impact-Aware SCA

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Yamcs Cross-site Scripting vulnerability (Medium 5.4)