CVE-2026-50636
LimeSurvey RemoteControl invite_participants/remind_participants SQL Injection
Description
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.
INFO
Published Date :
June 9, 2026, 6:17 p.m.
Last Modified :
July 23, 2026, 8:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Validate and parameterize all token-ID array inputs.
- Ensure prepared statements are not emulated.
- Disable MySQL multi-statements if possible.
- Restrict API access to trusted sources.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-50636.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-50636 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-50636
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-50636 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-50636 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: LimeSurvey, Description: Los métodos de la API RemoteControl invite_participants y remind_participants pasan un array de ID de token proporcionado por el llamador a TokenDynamic::findUninvited(), que concatena los valores directamente en una cláusula SQL tid IN ('...') sin parametrización o validación de entrada. Un atacante remoto y autenticado que posee el permiso tokens/update en una encuesta puede inyectar un elemento de array manipulado para realizar una inyección SQL. Debido a que LimeSurvey configura su conexión PDO con sentencias preparadas emuladas (emulatePrepare = true) y no deshabilita las multi-sentencias de MySQL, la inyección soporta consultas apiladas: el atacante puede añadir sentencias adicionales arbitrarias (INSERT/UPDATE/DELETE/DROP/CREATE) después del SELECT original. Esto permite tanto la lectura arbitraria de cualquier dato en la base de datos, como hashes de contraseña bcrypt de administrador (lime_users), PII de respuestas de encuestas, registros de sesión y configuraciones globales, todo recuperable a través de un oráculo ciego basado en tiempo SLEEP(), como la escritura/destrucción arbitraria de esos datos, incluyendo la sobrescritura directa del hash de contraseña del administrador para una toma de control de cuenta inmediata o la eliminación/truncamiento de tablas. Las lecturas y escrituras se extienden a cualquier esquema al que el usuario de la base de datos de la aplicación pueda acceder. La interfaz RemoteControl (RPCInterface = json/xml) debe estar habilitada, lo cual no es la configuración predeterminada. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'LimeSurvey', 'product': 'LimeSurvey', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '7.0'}, {'status': 'unaffected', 'version': '7.0.1', 'versionType': 'custom'}], 'defaultStatus': 'unknown'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-50636', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-09T18:58:04.976452Z'} -
New CVE Received by [email protected]
Jun. 09, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-89 Added Reference https://github.com/LimeSurvey/LimeSurvey/pull/5031 Added Reference https://www.limesurvey.org/ Added Reference https://www.vulncheck.com/advisories/limesurvey-remotecontrol-invite-participants-remind-participants-sql-injection