Unauthenticated File Download Vulnerability in LimeSurvey by LimeSurvey GmbH
CVE-2025-34120

8.7HIGH

Key Information:

Vendor

Limesurvey Gmbh

Status
Limesurvey
Vendor
CVE Published:
16 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-34120?

An unauthenticated file download vulnerability is present in specific versions of LimeSurvey. The issue arises due to inadequate validation of serialized input at the admin backup endpoint, which leads to the exploitation of arbitrary file paths. Attackers can craft a payload to access sensitive files stored on the host system, including OS and configuration files, compromising the security of the application. This vulnerability allows unauthorized users to download files packaged in a ZIP archive without requiring authentication, posing serious security risks.

Affected Version(s)

LimeSurvey 2.0+ <= 2.06+ Build 151014

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-34120 - Proof of Concept

CVE-2025-34120 - Proof of Concept

References

https://web.archive.org/web/20210123073627/https://www.li...
vendor-advisorypatch
https://sec-consult.com/vulnerability-lab/advisory/multip...
third-party-advisorytechnical-description
https://raw.githubusercontent.com/rapid7/metasploit-frame...
exploit

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Pichaya Morimoto
.
CVE-2025-34120 : Unauthenticated File Download Vulnerability in LimeSurvey by LimeSurvey GmbH