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CVE-2026-50636— LimeSurvey RemoteControl invite_participants/remind_participants SQL Injection

Quick assessment

Affected
LimeSurvey LimeSurvey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LimeSurvey（PHPSurveyor）是LimeSurvey团队的一套开源的在线问卷调查程序，它支持调查程序开发、调查问卷发布以及数据收集等功能。 LimeSurvey存在SQL注入漏洞，该漏洞源于RemoteControl API方法将调用者提供的令牌ID数组直接拼接进SQL子句而未参数化或输入验证，可能导致远程认证攻击者执行SQL注入，实现任意数据读写和账户接管。以下版本受到影响：RemoteControl接口启用时。

CVSS 8.8 · High EPSS 0.60% · P47

Affected Version Matrix 2

VendorProduct Version RangeStatus
LimeSurvey LimeSurvey ≤ 7.0 affected
7.0.1 unaffected
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I. Basic Information for CVE-2026-50636

Vulnerability Information
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Vulnerability Title
LimeSurvey RemoteControl invite_participants/remind_participants SQL Injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: CVE Program / CVE List V5
Vulnerability Title
LimeSurvey SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LimeSurvey（PHPSurveyor）是LimeSurvey团队的一套开源的在线问卷调查程序，它支持调查程序开发、调查问卷发布以及数据收集等功能。 LimeSurvey存在SQL注入漏洞，该漏洞源于RemoteControl API方法将调用者提供的令牌ID数组直接拼接进SQL子句而未参数化或输入验证，可能导致远程认证攻击者执行SQL注入，实现任意数据读写和账户接管。以下版本受到影响：RemoteControl接口启用时。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LimeSurvey LimeSurvey 0 ~ 7.0 -

II. Public POCs for CVE-2026-50636

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III. Intelligence Information for CVE-2026-50636

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Patches & Fixes for CVE-2026-50636 (1)

Vendor Advisories for CVE-2026-50636 (1)

Vendor Pages for CVE-2026-50636 (1)

IV. Related Vulnerabilities

Same product: LimeSurvey
Same vendor: LimeSurvey
Same weakness: CWE-89

V. Comments for CVE-2026-50636

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