---
id: CVE-2026-50636
title: >-
  The RemoteControl API methods invite_participants and remind_participants pass
  a caller-supplied token-ID array into TokenDynamic::findUninvited(), which
  concatenates the values directly into a tid IN ('...') SQL clause without
  parameter…
summary: >-
  The RemoteControl API methods invite_participants and remind_participants pass
  a caller-supplied token-ID array into TokenDynamic::findUninvited(), which
  concatenates the values directly into a tid IN ('...') SQL clause without
  parameter…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-89
vendor: LimeSurvey
product: LimeSurvey
affected:
  - LimeSurvey <= 7.0
published: '2026-06-09'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:19.373'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50636'
references:
  - url: 'https://github.com/LimeSurvey/LimeSurvey/pull/5031'
    label: disclosure@vulncheck.com
  - url: 'https://www.limesurvey.org/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/limesurvey-remotecontrol-invite-participants-remind-participants-sql-injection
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-09T18:58:04.976452Z'
epss: 0.00596
epssPercentile: 0.46786
ingestedAt: '2026-10-08T16:52:14.686Z'
---

## Overview

The RemoteControl API methods invite_participants and remind_participants pass a caller-supplied token-ID array into TokenDynamic::findUninvited(), which concatenates the values directly into a tid IN ('...') SQL clause without parameterization or input validation. A remote, authenticated attacker holding the tokens/update permission on a survey can inject a crafted array element to perform SQL injection. Because LimeSurvey configures its PDO connection with emulated prepared statements (emulatePrepare = true) and does not disable MySQL multi-statements, the injection supports stacked queries: the attacker can append arbitrary additional statements (INSERT/UPDATE/DELETE/DROP/CREATE) after the original SELECT. This permits both arbitrary read of any data in the database, such as administrator bcrypt password hashes (lime_users), survey response PII, session records, and global settings, all recoverable via a SLEEP() time-based blind oracle, and arbitrary write/destruction of that data, including directly overwriting the administrator password hash for immediate account takeover or dropping/truncating tables. Reads and writes extend to any schema the application's database user can access. The RemoteControl interface (RPCInterface = json/xml) must be enabled, which is not the default.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.