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WeGIA EUVDEUVD-2026-63351

| CVE-2026-76633 HIGH
Missing Authorization (CWE-862)
2026-08-20 VulnCheck GHSA-8248-cv95-x854
8.6
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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
8.1 HIGH

Network-reachable, low complexity; PR:L as any authenticated session suffices; no scope change since impact is confined to the attacker's own account; no availability impact.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Aug 20, 2026 - 14:20 vuln.today
Patch available
Aug 20, 2026 - 14:02 EUVD
CVE Published
Aug 20, 2026 - 13:46 cve.org
HIGH 8.6

DescriptionCVE.org

WeGIA before 3.9.2 contains an authorization bypass vulnerability in the password change flow that allows any authenticated user to change their account password without providing existing credentials by exploiting the unconditional exclusion of the alterarSenha method from permission checks in controle/control.php. Attackers can manipulate the redir parameter to point to alterar_senha.php, routing through verificarSenhaConfig() instead of verificarSenha() to bypass current password verification and convert temporary session access into permanent account takeover.

AnalysisAI

Password change authorization bypass in WeGIA before 3.9.2 allows any authenticated user to permanently take over their own account - or one they hold temporary session access to - without supplying the existing password. The alterarSenha method is unconditionally excluded from permission checks in controle/control.php, and manipulating the redir parameter routes password-change requests through verificarSenhaConfig() rather than the credential-verifying verificarSenha(), stripping the old-password requirement entirely. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain any valid WeGIA session
Delivery
Craft HTTP request with redir=alterar_senha.php
Exploit
Route through verificarSenhaConfig() bypassing verificarSenha()
Execution
Submit new password without old-password verification
Impact
Permanent account takeover established

Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated session in WeGIA at any privilege level - the vulnerability does not affect unauthenticated users. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N) scores 8.6, reflecting a realistic threat model: network-reachable, low complexity, requires only a low-privilege authenticated session, and yields full account control. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with any valid WeGIA session - including a low-privilege user, a guest, or someone who obtained temporary session access through a separate means - crafts an HTTP request to the password-change endpoint, setting the `redir` parameter to `alterar_senha.php`. This routes the request through `verificarSenhaConfig()`, which skips current-password verification, allowing the attacker to set an arbitrary new password for the account and establish permanent control. …
Remediation The primary fix is to upgrade to WeGIA 3.9.2, which resolves the unconditional exclusion of `alterarSenha` from permission checks per the vendor release at https://github.com/LabRedesCefetRJ/WeGIA/releases#release-3.9.2 and security advisory GHSA-gfcx-7973-hjmp. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all WeGIA deployments running versions before 3.9.2 and document their inventory; consider temporarily restricting non-essential access to these systems. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-63351 vulnerability details – vuln.today

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