CVE WatchJul 23, 2026

CVE-2026-50635

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHost

CVSS

8.8

High

EPSS

0.4%

p31

KEV

—

Exploit Today

0-100

Published: Jun 9, 2026 · Last modified: Jul 23, 2026 · CWE-640

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-08-222026-09-19

Technical description

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account.

Official references

Related CVEs

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