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YesWiki EUVDEUVD-2026-91449

| CVE-2026-104439 HIGH
Observable Response Discrepancy (CWE-204)
2026-10-02 VulnCheck GHSA-q8mj-q84p-cx6f
PHP Information Disclosure Yeswiki
7.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/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
vuln.today AI
5.3 MEDIUM

Remote unauthenticated attacker submits emails directly with no victim interaction (UI:N), and the only leak is account-existence, so confidentiality is Low with no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Oct 02, 2026 - 15:27 vuln.today
Analysis Generated
Oct 02, 2026 - 12:22 vuln.today
Patch available
Oct 02, 2026 - 12:02 EUVD
CVE Published
Oct 02, 2026 - 11:38 cve.org
HIGH 7.1

DescriptionCVE.org

YesWiki before 4.6.7 contains a user enumeration vulnerability in LostPasswordAction.php that allows unauthenticated attackers to confirm registered email addresses through differing responses. Attackers can submit emails to the MotDePassePerdu recovery page without rate limiting to identify valid accounts for targeted phishing or password-spraying.

AnalysisAI

Unauthenticated user enumeration in YesWiki before 4.6.7 allows remote attackers to confirm registered email addresses by observing differing responses from the MotDePassePerdu lost-password recovery endpoint, which lacks rate limiting. This CWE-204 information disclosure does not expose credentials or account contents but enables targeted phishing and password-spraying campaigns. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the YesWiki instance expose the MotDePassePerdu lost-password recovery feature (LostPasswordAction.php) to anonymous users, which is the default for the password-recovery flow, and that the instance run a version before 4.6.7. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but low-to-moderate priority issue, and the raw CVSS 4.0 score of 7.1 overstates real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to YesWiki 4.6.7 or later (vendor-released patch: 4.6.7). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all YesWiki instances and verify version; if version is below 4.6.7, apply the vendor-released patch to version 4.6.7 immediately. …

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EUVD-2026-91449 vulnerability details – vuln.today
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