External risk intelligence

Password Recovery Endpoint JWT Validation Flaw Allows Account Takeover.

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-93556

The vulnerability resides in a password recovery endpoint. Password reset and recovery functionality are designed to be internet-facing to allow users to regain access to their accounts from external networks, making this surface public-facing by design in normal deployment.

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in a password recovery function that could allow an unauthenticated attacker to reset the password for any user account, including administrative ones, potentially leading to unauthorized access and control of those accounts.

  • Attackers can reset any password without logging in.
  • This impacts account security and administrative access.
  • Confirm relevance and scope of affected user accounts.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker can manipulate a password recovery endpoint to reset the password for any user account. This is possible because the recovery token is not validated against the specified user ID, potentially allowing an attacker to gain control of any account, including administrative ones.

  • No authentication required.
  • Attacker manipulates user identifier.
  • Unauthorized account takeover risk.

Live Threat

Current exploitation, exposure, and threat context

The password recovery process could be exploited to reset any user's password, including administrative accounts, by manipulating a user identifier. This could lead to an attacker gaining unauthorized control over accounts.

  • User accounts and administrative access.
  • Unauthenticated manipulation of account identifiers.
  • Unauthorized account control.

Operational Fix

Recommended remediation, mitigation, and detection steps

The security of the password recovery endpoint requires immediate attention, likely involving application owners and infrastructure teams. The first critical step is to identify all instances of the affected technology, assess their exposure and business criticality, pinpoint the accountable owner for each instance, and then prioritize remediation based on risk.

  • Accountable owner must be identified.
  • Verify endpoint reachability and criticality.
  • Plan remediation based on confirmed risk.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is the software component impacted by CVE-2026-93556?

This CVE affects a password recovery module, specifically the ‘/password/guardarClau/recover’ endpoint. This component is designed to manage identity verification when users forget their credentials, allowing them to initiate a reset flow. It serves as a bridge between a user's request and the system's account database, making it a sensitive entry point for identity management.

What is the vulnerability class for CVE-2026-93556?

This vulnerability is classified as CWE-639, or Authorization Bypass Through User-Controlled Key. In simple terms, the application fails to verify that the person requesting a password reset is authorized to change the specific account ID they provided. Because the system trusts the user-supplied identifier without checking it against the session's security token, it allows an attacker to reset passwords for accounts they do not own.

How can an attacker trigger this vulnerability?

An attacker triggers this flaw by interacting directly with the recovery endpoint and substituting the target's account identifier. The bug occurs because the backend does not validate the JWT token against the specific user ID submitted. This issue is not triggered by standard, authorized password recovery attempts where the requester owns the account; it only manifests when the identifier is intentionally manipulated during the request.

Is my system at risk if it uses this password recovery function?

According to Halo Surface Signal, this vulnerability is very likely to be reachable because password recovery features are typically designed to be internet-facing. This design choice enables users to recover accounts from outside the office network. Consequently, if your implementation of this endpoint is exposed to the internet, it is inherently accessible to unauthorized actors, significantly increasing the risk of account takeover.

What should I do to address CVE-2026-93556?

Begin by identifying every instance of the affected technology within your environment. Determine which assets utilize this specific password recovery endpoint and assess their business criticality. Once your infrastructure teams locate these instances, assign accountability to the respective owners to prioritize the risk. The goal is to verify reachability and confirm the scope of exposure before applying necessary security patches or configuration changes.