---
title: "CVE-2023-45278: Yamcs API Directory Traversal vulnerability"
url: https://erroneo.us/security/cve/CVE-2023-45278/
description: "CVE-2023-45278 (org.yamcs:yamcs (Maven)): Directory Traversal vulnerability in the storage functionality of the API in Yamcs 5.8.6 allows attackers to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2023-10-19
date_modified: 2024-08-02
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2023-45278"
kev: false
cvss: 9.1
epss: 0.01831
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2023-45278: Yamcs API Directory Traversal vulnerability

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.8% , percentile 79: FIRST’s model estimates a 1.8% chance of exploitation activity in the next 30 days, higher than 79% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.yamcs:yamcs (Maven) < 5.8.7, fixed in 5.8.7 . Check your lockfile, including transitive dependencies.

## What it is

Directory Traversal vulnerability in the storage functionality of the API in Yamcs 5.8.6 allows attackers to delete arbitrary files via crafted HTTP DELETE request.

## Affected packages

- Maven `org.yamcs:yamcs` < 5.8.7 → fixed: 5.8.7

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- FIRST EPSS (model of 2026-10-21): 1.83% probability of exploitation activity in the next 30 days; percentile 79.

## Sources

- [GitHub Advisory GHSA-43fw-536j-w37j](https://github.com/advisories/GHSA-43fw-536j-w37j)
- [CVE.org record CVE-2023-45278](https://www.cve.org/CVERecord?id=CVE-2023-45278)
- [NVD entry CVE-2023-45278](https://nvd.nist.gov/vuln/detail/CVE-2023-45278)
- [github.com](https://github.com/yamcs/yamcs/compare/yamcs-5.8.6...yamcs-5.8.7)
- [linkedin.com](https://www.linkedin.com/pulse/yamcs-vulnerability-assessment-visionspace-technologies)

---
Source page: https://erroneo.us/security/cve/CVE-2023-45278/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt