---
id: "CVE-2026-121881"
page: "https://infrastack.ai/live/CVE-2026-121881"
kind: "vulnerability"
aliases: ["CVE-2026-121881"]
title: "Posit Workbench: SQL injection lets logged-in users read database contents"
severity: "medium"
cvss: 5.7
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["data-science", "posit-workbench", "rstudio", "runtime", "self-hosted"]
not_affected_if: ["no-user-accounts", "posit-workbench-2026.08.0-or-later"]
published_at: "2026-11-06T16:17:53+00:00"
first_seen_at: "2026-11-06T16:42:41+00:00"
updated_at: "2026-11-06T16:44:42+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121881", "first_seen_at": "2026-11-06T16:42:41+00:00"}]
exploit_sources: []
---

# Posit Workbench: SQL injection lets logged-in users read database contents

Link for people: https://infrastack.ai/live/CVE-2026-121881 (this .md is for agents)

A SQL injection flaw in the get_last_seen session-state RPC of Posit Workbench lets an authenticated user pass crafted sessionIds values to the database. An attacker can read arbitrary data from the Workbench database, but cannot change it.

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

## How to check

- Check the installed Posit Workbench version (for example with `rstudio-server version` on the server) and compare it with `2026.08.0`.
- Confirm whether any users outside the admin team can log in to the server.

## Fix

- Posit Workbench: move to `2026.08.0` or later.

## Timeline

- 2026-11-06T16:42:41+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121881

## From the sources

SQL injection vulnerability in the get_last_seen code-server session-state RPC in Posit Software, PBC Posit Workbench before 2026.08.0 allows authenticated users to read arbitrary data from the Workbench database via the sessionIds parameter.



NOTE: exploitation requires a valid authenticated session; no administrative privileges are needed. The vulnerability is limited to disclosure of database contents.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_