---
id: CVE-2026-91775
title: >-
  LimeSurvey fails to safely encode attacker-controlled content from a crafted
  .lss survey file when displaying import warnings, resulting in XSS in the
  administrative interface.
summary: >-
  LimeSurvey fails to safely encode attacker-controlled content from a crafted
  .lss survey file when displaying import warnings, resulting in XSS in the
  administrative interface.
severity: high
cvss: 7.4
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N'
cwe:
  - CWE-79
vendor: LimeSurvey
product: LimeSurvey
affected:
  - LimeSurvey 7.0.14
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:17:11.253'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91775'
references:
  - url: 'https://fluidattacks.com/advisories/alone'
    label: help@fluidattacks.com
  - url: 'https://github.com/LimeSurvey/LimeSurvey'
    label: help@fluidattacks.com
  - url: >-
      https://github.com/LimeSurvey/LimeSurvey/commit/c96db8093e852eb8b1a2ebbb32478d6fb34cb651
    label: help@fluidattacks.com
  - url: 'https://fluidattacks.com/advisories/alone'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-23T17:43:57.136684Z'
cvssSource: cna
ingestedAt: '2026-09-23T17:28:14.861Z'
epss: 0.0038
epssPercentile: 0.29203
---

## Overview

LimeSurvey fails to safely encode attacker-controlled content from a crafted .lss survey file when displaying import warnings, resulting in XSS in the administrative interface.

## Remediation

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