---
id: "CVE-2026-121413"
kind: "vulnerability"
aliases: ["CVE-2026-121413"]
title: "Parse Server: session upgrade endpoint mints new sessions without permission check"
severity: "low"
cvss: 3.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["node", "package", "parse-server", "self-hosted"]
not_affected_if: ["fixed-version", "managed-hosting"]
published_at: "2026-11-03T15:17:30+00:00"
first_seen_at: "2026-11-03T15:21:58+00:00"
updated_at: "2026-11-03T15:24:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121413", "first_seen_at": "2026-11-03T15:21:58+00:00"}]
---

# Parse Server: session upgrade endpoint mints new sessions without permission check

Parse Server's session upgrade endpoint creates new sessions for anyone holding a valid session token, ignoring the _Session create permission. An attacker with a stolen token can obtain sessions that survive the original user logging out.

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

## How to check

- Check the installed Parse Server version with `npm ls parse-server` and compare it to the fixed versions below.
- Look for calls to `/upgradeToRevocableSession` in server or proxy logs.

## Fix

- Parse Server before `8.6.112`: upgrade to `8.6.112` or later.
- Parse Server `9.0.0` before `9.10.6-alpha.4`: upgrade to `9.10.6-alpha.4` or later.

## Timeline

- 2026-11-03T15:21:58+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121413

## Documents

- [advisory] Vendor advisory: github.com https://github.com/parse-community/parse-server/security/advisories/GHSA-2j2x-c587-q33g
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/parse-server-before-8.6.112-and-9.0.0-before-9.10.6-alpha.4-session-permission-bypass-via-upgradetorevocablesession

## From the sources

Parse Server before 8.6.112 and 9.0.0 before 9.10.6-alpha.4 contains an authorization bypass in the session upgrade endpoint, which creates a new session for any valid session token without enforcing the _Session class create class-level permission. Attackers holding a user's session token can send an already revocable token to /upgradeToRevocableSession to obtain additional sessions with fresh expiration that persist after the original session is logged out.

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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_