Host Header Injection Vulnerability in LimeSurvey by LimeSurvey GmbH
CVE-2026-50635

8.7HIGH

Key Information:

Vendor

Limesurvey

Status
Limesurvey
Vendor
CVE Published:
9 June 2026

What is CVE-2026-50635?

A vulnerability in LimeSurvey allows attackers to exploit the password reset functionality by manipulating the HTTP Host header. The missing validation in the host allowlist means that a remote, unauthenticated attacker can trigger a password reset request. By submitting a request with a spoofed Host header, the attacker receives a reset link that contains a valid token, placing the account at risk of unauthorized access. When the target interacts with the link, the token is disclosed to the attacker, enabling them to take over the account.

Affected Version(s)

LimeSurvey 0 <= 7.0

LimeSurvey 7.0.1

References

https://github.com/LimeSurvey/LimeSurvey/pull/5032
issue-tracking
https://www.limesurvey.org/
product
https://www.vulncheck.com/advisories/limesurvey-password-...
third-party-advisory

CVSS V4

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

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

McCaulay Hudson (@_McCaulay) of watchTowr
.