Auth bypass in Limesurvey Gmbh
CVE-2025-34120
An unauthenticated file download vulnerability exists in LimeSurvey versions from 2.0+ up to and including 2.06+ Build 151014. The application fails to validate serialized input to the admin backup endpoint (`index.php/admin/update/sa/back…
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.699 (98.7th percentile) — read the EPSS interpretation.
Affected products
- Limesurvey Gmbh — versions 2.0+
Weakness classification (CWE)
Public proof-of-concept exploits
References
- web.archive.org/web/20210123073627/https://www.limesurvey.org/blog/22-security/… (vendor-advisory, patch)
- sec-consult.com/vulnerability-lab/advisory/multiple-critical-vulnerabilities-in… (third-party-advisory, technical-description)
- raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/… (exploit)
- packetstorm.news/files/id/180855 (exploit)
- www.vulncheck.com/advisories/limesurvey-unauthenticated-arbitrary-file-download (third-party-advisory)
Frequently asked questions
- What is CVE-2025-34120?
- CVE-2025-34120 is a vulnerability in Limesurvey Gmbh, classified under Path Traversal. Published 2025-07-16.
- Is CVE-2025-34120 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.