CVE-2026-50635
LimeSurvey Password Reset Host Header Injection Discloses Reset Token
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.
INFO
Published Date :
June 9, 2026, 6:17 p.m.
Last Modified :
July 23, 2026, 8:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Define and configure the allowedHosts parameter.
- Update LimeSurvey to the latest version.
- Review application security configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-50635.
| URL | Resource |
|---|---|
| https://github.com/LimeSurvey/LimeSurvey/pull/5032 | |
| https://www.limesurvey.org/ | |
| https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-50635 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-50635
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-50635 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-50635 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: LimeSurvey, Description: LimeSurvey construye enlaces de restablecimiento de contraseña de cuenta a partir del encabezado Host HTTP proporcionado por el cliente sin validarlo. La lista de permitidos opcional allowedHosts que restringiría esto no está definida en la configuración predeterminada (y documentada), por lo que LSHttpRequest::checkIsAllowedHost() no realiza ninguna operación. Un atacante remoto y no autenticado que envía una solicitud de contraseña olvidada para una cuenta conocida (que requiere solo el nombre de usuario y el correo electrónico del objetivo) con un encabezado Host falsificado hace que LimeSurvey envíe por correo electrónico a esa cuenta un enlace de restablecimiento cuyo nombre de host está controlado por el atacante, mientras incrusta la validation_key genuina. Cuando el destinatario o un escáner automatizado de enlaces de seguridad de correo entrante desreferencia el enlace, el token de restablecimiento válido se revela al atacante, quien lo reproduce contra el endpoint newPassword del host legítimo para establecer una nueva contraseña y tomar el control de la cuenta. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'LimeSurvey', 'product': 'LimeSurvey', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '7.0'}, {'status': 'unaffected', 'version': '7.0.1', 'versionType': 'custom'}], 'defaultStatus': 'unknown'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-50635', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-09T18:20:43.192036Z'} -
New CVE Received by [email protected]
Jun. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-640 Added Reference https://github.com/LimeSurvey/LimeSurvey/pull/5032 Added Reference https://www.limesurvey.org/ Added Reference https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token