CVE-2026-44159: Tyler Identity Local Auth Bypass Flaw

CVE-2026-44159 Overview

CVE-2026-44159 affects Tyler Identity Local (TID-L), an identity management product that ships with documented, default administrative credentials. Deployments do not force credential rotation before use, leaving administrative accounts accessible to any attacker who reads vendor documentation. The product has not been distributed since December 2020 and lost vendor support in 2021, so no patched version exists. The weakness maps to [CWE-1392: Use of Default Credentials] and is exploitable across the network without authentication or user interaction.

Critical Impact
An unauthenticated remote attacker with network access can log in using publicly documented default administrative credentials and fully compromise the identity service, exposing confidentiality, integrity, and availability of authenticated systems.

Affected Products

Tyler Identity Local (TID-L) — all distributed versions
TID-L deployments installed on or before December 2020
Any environment still running TID-L after end of support in 2021

Discovery Timeline

2026-05-19 - CVE-2026-44159 published to the National Vulnerability Database
2026-05-19 - Last updated in NVD database

Technical Details for CVE-2026-44159

Vulnerability Analysis

Tyler Identity Local (TID-L) installs with administrative credentials that are documented in vendor materials. The installer does not require operators to change these credentials before the service is exposed. Because TID-L provides identity and authentication services, a successful login with the default account grants control over downstream applications that rely on it for user authentication and authorization. The product reached end of distribution in December 2020 and end of support in 2021, so no security update will be issued. Existing installations remain exploitable until removed or fully isolated. The classification under [CWE-1392] reflects the use of well-known default credentials rather than a memory safety or input validation flaw.

Root Cause

The root cause is a design decision to ship a working administrative account with fixed, documented credentials and no enforced change-on-first-use workflow. Operators who follow the default installation path leave the account in place. Because the credentials appear in public documentation, the secret provides no security boundary.

Attack Vector

The attack is remote and unauthenticated. An attacker reaches the TID-L administrative interface over the network, submits the documented credentials, and receives an administrative session. From there the attacker can create accounts, modify identity records, issue tokens, and pivot into any application that trusts TID-L for authentication. No social engineering, exploit code, or memory corruption primitive is required.

No verified public exploit code is required because exploitation reduces to logging in with documented values. See the CISA CSAF Document and the CVE.org Record for CVE-2026-44159 for the authoritative technical description.

Detection Methods for CVE-2026-44159

Indicators of Compromise

Successful administrative logins to TID-L from unexpected source addresses, especially outside maintenance windows.
Creation of new administrative or service accounts in TID-L without a corresponding change ticket.
Issuance of authentication tokens or session cookies for privileged users not tied to a known interactive session.
Configuration changes to identity providers, trust relationships, or password policies in TID-L audit logs.

Detection Strategies

Inventory all systems still running TID-L and treat any presence as a finding given the product is unsupported.
Alert on any authentication attempt using the documented default administrative username against TID-L endpoints.
Correlate TID-L admin logins with downstream application authorization events to surface lateral movement.
Review historical authentication logs back to 2020 for evidence of prior use of default credentials.

Monitoring Recommendations

Forward TID-L authentication and audit logs to a central log platform with long retention.
Monitor north-south and east-west traffic to TID-L management ports and alert on access from non-administrative subnets.
Track changes to identity federation configurations and SAML or OIDC trust settings.

How to Mitigate CVE-2026-44159

Immediate Actions Required

Decommission Tyler Identity Local (TID-L) and migrate authentication to a supported identity provider, since the product is end of life.
If immediate removal is not possible, change the documented default administrative credentials to a strong, unique value and rotate all other local accounts.
Restrict network access to TID-L management interfaces to a dedicated administrative network or jump host.
Audit all accounts, tokens, and trust relationships managed by TID-L for unauthorized changes.

Patch Information

No patch is available. Tyler Identity Local (TID-L) has not been distributed since December 2020 and has not been supported since 2021. The only durable remediation is to migrate off the product and remove it from the environment. Refer to the CISA CSAF Document for vendor and coordinator guidance.

Workarounds

Place TID-L behind a network segment that denies inbound traffic from user and internet-facing networks.
Require VPN plus multi-factor authentication for any administrator who must reach the TID-L console.
Disable or remove unused local accounts and disable any documented default account that is not strictly required.
Plan and execute a migration to a supported identity platform with enforced credential rotation and MFA.

bash

# Configuration example: restrict access to TID-L management interface
# Replace 10.10.20.0/24 with your administrative subnet and <TID-L-IP> with the host address

iptables -A INPUT -p tcp -s 10.10.20.0/24 -d <TID-L-IP> --dport 443 -j ACCEPT
iptables -A INPUT -p tcp -d <TID-L-IP> --dport 443 -j DROP