CVE-2026-50635Network attack vector

Account takeover via poisoned password-reset links

Published Jun 9, 2026 · Updated Jun 9, 2026

Weak password recovery in LimeSurvey 7.0 and earlier allows remote attackers to take over accounts through poisoned reset links. The password-reset flow builds the emailed URL from the unvalidated HTTP Host header, while a null allowedHosts setting leaves LSHttpRequest::checkIsAllowedHost() ineffective. No authentication is required, but the attacker must know the username and email and relies on a recipient or mail scanner opening the link to disclose the validation_key for replay.

CVSS severity8.7
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak password recovery in LimeSurvey 7.0 and earlier allows remote attackers to take over accounts through poisoned reset links. The password-reset flow builds the emailed URL from the unvalidated HTTP Host header, while a null allowedHosts setting leaves LSHttpRequest::checkIsAllowedHost() ineffective. No authentication is required, but the attacker must know the username and email and relies on a recipient or mail scanner opening the link to disclose the validation_key for replay.

The record

CVE
CVE-2026-50635
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
LimeSurvey GmbH
Product
LimeSurvey
Classifications
CWE-640, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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.

  1. Affected versionversion=0 <=7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LimeSurvey GmbH · LimeSurveyversion=0 <=7.0

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-640Weak Password Recovery Mechanism for Forgotten Password
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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