Authenticated SSRF via unvalidated Host header
Published Jul 20, 2026 · Updated Jul 20, 2026
SSRF in LimeSurvey 6.x through 6.17.10 and 7.x through 7.0.4 allows remote authenticated users to read HTTP responses via a crafted Host header. The getTemplateData() function builds a curl URL directly from HTTP_HOST and returns the fetched response body without validating the destination. Exploitation requires REST API authentication and read access to one survey; a reverse proxy that enforces a fixed Host header blocks the vector.
Summary
What happened
SSRF in LimeSurvey 6.x through 6.17.10 and 7.x through 7.0.4 allows remote authenticated users to read HTTP responses via a crafted Host header. The getTemplateData() function builds a curl URL directly from HTTP_HOST and returns the fetched response body without validating the destination. Exploitation requires REST API authentication and read access to one survey; a reverse proxy that enforces a fixed Host header blocks the vector.
The record
- CVE
- CVE-2026-63107
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- LimeSurvey GmbH
- Product
- LimeSurvey
- Classifications
- CWE-918, T1552.005, T1046
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=6.17.10
- Affected versionversion=0 <=7.0.4
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- SSRF via Host Header Injection PoCproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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