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CVE-2026-50635— LimeSurvey Password Reset Host Header Injection Discloses Reset Token

Quick assessment

Affected
LimeSurvey LimeSurvey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LimeSurvey（PHPSurveyor）是LimeSurvey团队的一套开源的在线问卷调查程序，它支持调查程序开发、调查问卷发布以及数据收集等功能。 LimeSurvey存在授权问题漏洞，该漏洞源于从客户端提供的HTTP Host头构建密码重置链接而未验证，可能导致远程未认证攻击者通过伪造Host头获取重置令牌并接管账户。

CVSS 8.8 · High EPSS 0.66% · P50

Affected Version Matrix 2

VendorProduct Version RangeStatus
LimeSurvey LimeSurvey ≤ 7.0 affected
7.0.1 unaffected
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I. Basic Information for CVE-2026-50635

Vulnerability Information
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Vulnerability Title
LimeSurvey Password Reset Host Header Injection Discloses Reset Token
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
忘记口令恢复机制弱
Source: CVE Program / CVE List V5
Vulnerability Title
LimeSurvey 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LimeSurvey（PHPSurveyor）是LimeSurvey团队的一套开源的在线问卷调查程序，它支持调查程序开发、调查问卷发布以及数据收集等功能。 LimeSurvey存在授权问题漏洞，该漏洞源于从客户端提供的HTTP Host头构建密码重置链接而未验证，可能导致远程未认证攻击者通过伪造Host头获取重置令牌并接管账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LimeSurvey LimeSurvey 0 ~ 7.0 -

II. Public POCs for CVE-2026-50635

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III. Intelligence Information for CVE-2026-50635

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Patches & Fixes for CVE-2026-50635 (1)

Vendor Advisories for CVE-2026-50635 (1)

Vendor Pages for CVE-2026-50635 (1)

IV. Related Vulnerabilities

Same product: LimeSurvey
Same vendor: LimeSurvey
Same weakness: CWE-640

V. Comments for CVE-2026-50635

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