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PatchSiren cyber security CVE debrief

CVE-2026-50636 LimeSurvey CVE debrief

CVE-2026-50636 is a HIGH severity vulnerability in LimeSurvey's RemoteControl API. The invite_participants and remind_participants methods are susceptible to SQL injection due to improper handling of user-supplied token-ID arrays. An authenticated attacker with the tokens/update permission can inject malicious SQL, enabling arbitrary data reads and writes across the database, including sensitive information like administrator password hashes and survey responses.

Vendor
LimeSurvey
Product
Unknown
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

Who should care

Administrators and users of LimeSurvey, especially those with the RemoteControl interface enabled, should be aware of this vulnerability. It allows for SQL injection, which can lead to unauthorized data access and modification.

Technical 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 parameterization or input validation. This allows for SQL injection attacks, potentially leading to arbitrary data reads and writes.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or updates provided by LimeSurvey to fix the SQL injection vulnerability.
  • Disable the RemoteControl interface if not in use.
  • Restrict access to the tokens/update permission.
  • Monitor for suspicious activity on the LimeSurvey installation.

Evidence notes

The CVE-2026-50636 vulnerability was identified in LimeSurvey's RemoteControl API. The vulnerability allows for SQL injection attacks due to improper input validation. The CVSS score is 8.7, indicating a HIGH severity level.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50636 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50636

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50636 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50636

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.