---
id: "CVE-2026-117469"
kind: "vulnerability"
aliases: ["CVE-2026-117469"]
title: "Psono Server: read-only users can append data to owners' files"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["file-sharing", "package", "password-manager", "psono", "self-hosted"]
not_affected_if: ["auth-required"]
published_at: "2026-10-27T06:17:24+00:00"
first_seen_at: "2026-10-27T06:25:21+00:00"
updated_at: "2026-10-27T06:26:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117469", "first_seen_at": "2026-10-27T06:25:21+00:00"}]
---

# Psono Server: read-only users can append data to owners' files

Psono Server 1.0.0 through 7.2.3 does not check whether a file-transfer credential is meant for download or upload. An authenticated user with read-only access to a file can use a download credential at the upload endpoint, letting them write or overwrite repository objects and use up storage.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- Upgrade Psono Server to a version later than `7.2.3` once a fixed release is confirmed (sources do not name one).

## Timeline

- 2026-10-27T06:25:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117469

## From the sources

Psono Server (CE & EE) versions 1.0.0 through 7.2.3 did not enforce the direction of file-transfer credentials on file-repository operations. An authenticated remote attacker with read-only access to a file could present a download transfer to the upload endpoint, obtain a signed upload URL for an attacker-selected object key, and append a chunk to the owner's file. Exploitation could upload or overwrite repository objects and consume storage, subject to transfer size, chunk-count, and lifetime limits.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_