External risk intelligence

Stela Authentication Bypass Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-101287

The vulnerability exists in the authentication mechanism of a web application. Such applications are commonly deployed as internet-facing services to allow remote user access, making the login and authentication endpoints directly reachable and commonly exposed to the public internet in standard deployment patterns.

Authentication Bypass

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

An authentication bypass vulnerability has been identified in the Stela application, which could allow an attacker to impersonate any user, including administrators, by manipulating authentication cookies. This could compromise the confidentiality and integrity of the application's data.

  • Bypasses application login using modified cookies.
  • Critical access could be gained by unauthorized users.
  • Confirm Stela's presence and direct exposure.

Attack Path

How an attacker could exploit the issue

An attacker can bypass Stela's login process by altering a cookie that contains user authentication details. This manipulation allows them to impersonate any user, including administrators, to gain unauthorized access and potentially compromise application data.

  • Attacker can reach without authentication.
  • Bypasses authentication by tampering with cookie.
  • Risk of unauthorized access and data compromise.

Live Threat

Current exploitation, exposure, and threat context

A remote attacker could bypass authentication to impersonate any user, including administrators. This could lead to unauthorized access and modification of application data.

  • Application data and functionality at risk.
  • Attacker manipulates authentication cookie.
  • Compromises confidentiality and integrity.

Operational Fix

Recommended remediation, mitigation, and detection steps

This authentication bypass vulnerability in Stela directly impacts application owners and the platform team responsible for its deployment and maintenance. The first practical step is to inventory all Stela instances, confirm their exposure and business criticality, and then identify the specific owner for each instance to plan remediation.

  • Application owners must confirm Stela instances.
  • Verify Stela reachability and business criticality.
  • Plan remediation with the platform team.

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 Stela?

Stela is a web-based software application designed to manage user sessions and authentication processes. It typically functions as a platform for handling secure access to digital resources, relying on structured data stored in browser cookies to verify user identity and manage login states during a session.

How does CVE-2026-101287 enable authentication bypass?

This vulnerability is classified as CWE-565, which involves relying on untrusted inputs in a security decision. In Stela, the application trusts the 'authProcess' cookie to determine if a user is logged in. Because the system fails to verify the integrity of the information inside this cookie, an attacker can manually modify the user ID and status values to convince the application that they are already authenticated as any user, including a system administrator.

Do I need to interact with other users to trigger this bug?

No. A remote attacker can exploit this independently without needing valid credentials or any interaction from existing users. The vulnerability is triggered solely by sending a specifically crafted request to the application that contains a manipulated 'authProcess' cookie; the flaw lies entirely in the application's internal trust of that client-side data.

Why is this CVE concerning for internet-facing systems?

According to Halo Surface Signal, this vulnerability is particularly significant for internet-facing instances. Because Stela is frequently deployed to allow remote access, these login endpoints are often directly reachable from the public internet. This visibility means attackers can attempt to manipulate authentication cookies from anywhere, increasing the likelihood that they can successfully bypass security controls.

What should I do first if I run Stela?

Your immediate priority is to conduct a thorough inventory of all Stela instances within your environment. Once you have identified these assets, verify their current reachability and overall business criticality. Use this information to coordinate with your platform team and designated application owners to establish a clear plan for applying the necessary updates.