CVE-2026-25538: Devtron Auth Bypass Vulnerability

CVE-2026-25538 Overview

CVE-2026-25538 is a critical Missing Authorization vulnerability (CWE-862) affecting Devtron, an open source tool integration platform for Kubernetes. The vulnerability exists in Devtron's Attributes API interface, allowing any authenticated user—including low-privileged CI/CD Developers—to obtain the global API Token signing key by accessing the /orchestrator/attributes?key=apiTokenSecret endpoint. After obtaining this key, attackers can forge JWT tokens for arbitrary user identities offline, gaining complete control over the Devtron platform and enabling lateral movement to the underlying Kubernetes cluster.

Critical Impact

Authenticated attackers can extract the API Token signing key and forge JWT tokens to impersonate any user, potentially compromising the entire Kubernetes infrastructure managed by Devtron.

Affected Products

• Devtron version 2.0.0 and prior

Discovery Timeline

• February 4, 2026 - CVE-2026-25538 published to NVD
• February 5, 2026 - Last updated in NVD database

Technical Details for CVE-2026-25538

Vulnerability Analysis

This vulnerability represents a critical authorization bypass affecting Devtron's Attributes API. The root issue is the absence of proper access controls on the /orchestrator/attributes?key=apiTokenSecret endpoint. Any authenticated user, regardless of their privilege level, can query this endpoint and retrieve the global API Token signing key used for JWT generation.

With access to this signing key, an attacker can craft valid JWT tokens for any user identity—including administrative accounts—without requiring access to their credentials. This enables complete platform takeover and, given Devtron's role as a Kubernetes integration platform, provides a direct pathway to compromise the underlying Kubernetes cluster infrastructure.

The vulnerability is particularly dangerous in multi-tenant environments where CI/CD Developers with limited permissions can escalate their access to full administrative control.

Root Cause

The root cause is Missing Authorization (CWE-862) in the Attributes API implementation. The endpoint responsible for returning attribute values did not differentiate between internal-only secrets and user-accessible configuration values. The apiTokenSecret key was exposed without any authorization checks to verify whether the requesting user should have access to sensitive cryptographic material.

Attack Vector

The attack vector is network-based and requires only low-privileged authenticated access. An attacker with valid credentials for any Devtron user account (such as a CI/CD Developer role) can:

1. Authenticate to the Devtron platform with their legitimate credentials
2. Send a GET request to /orchestrator/attributes?key=apiTokenSecret
3. Extract the API Token signing key from the response
4. Use the signing key to forge JWT tokens for any user identity offline
5. Access the platform as an administrator or any other privileged user
6. Leverage administrative access to compromise the Kubernetes cluster

The security patch introduces an InternalOnlyKeys map that explicitly blocks read and write access to sensitive internal attributes via the API:

 	UserPreferencesResourcesKey           = "resources"
 )
 
+// InternalOnlyKeys are the internal attribute keys - cannot be read or written via API
+var InternalOnlyKeys = map[string]bool{
+	API_SECRET_KEY: true,
+}
+
 type AttributesDto struct {
 	Id     int    `json:"id"`
 	Key    string `json:"key,omitempty"`

Source: GitHub Commit Details

Detection Methods for CVE-2026-25538

Indicators of Compromise

• HTTP requests to /orchestrator/attributes?key=apiTokenSecret from any user account
• Unusual JWT token usage patterns, particularly tokens created for high-privilege accounts
• Authentication events for administrative users from unexpected IP addresses or at unusual times
• API access patterns inconsistent with user role permissions

Detection Strategies

• Implement logging and alerting for all requests to the /orchestrator/attributes endpoint
• Monitor for JWT tokens with creation timestamps that don't correspond to legitimate authentication events
• Audit authentication logs for privilege escalation patterns or cross-account access
• Deploy network monitoring to detect reconnaissance activity against Devtron API endpoints

Monitoring Recommendations

• Enable detailed API access logging in Devtron and forward logs to a SIEM platform
• Create alerts for any access attempts to sensitive attribute keys
• Monitor Kubernetes audit logs for administrative actions following suspicious Devtron authentication events
• Implement anomaly detection for user behavior patterns that deviate from established baselines

How to Mitigate CVE-2026-25538

Immediate Actions Required

• Update Devtron to a version that includes commit d2b0d26 or later
• Rotate the API Token signing key immediately if exposure is suspected
• Audit logs for any unauthorized access to the /orchestrator/attributes?key=apiTokenSecret endpoint
• Review all JWT tokens and invalidate any that may have been forged
• Assess Kubernetes cluster for signs of unauthorized access or configuration changes

Patch Information

The vulnerability has been patched in commit d2b0d260d858ab1354b73a8f50f7f078ca62706f. The fix introduces an InternalOnlyKeys map that prevents sensitive internal attributes like API_SECRET_KEY from being read or written via the API. Organizations should update to a Devtron release that includes this patch. For detailed patch information, see the GitHub Security Advisory GHSA-8wpc-j9q9-j5m2.

Workarounds

• Implement network-level access controls to restrict access to the Devtron API endpoints to trusted networks only
• Deploy a web application firewall (WAF) rule to block requests containing apiTokenSecret in query parameters
• Review and minimize user accounts with access to the Devtron platform until the patch is applied
• Implement additional authentication layers such as VPN requirements for Devtron access

# Example: Block requests to sensitive endpoint via nginx
location /orchestrator/attributes {
    if ($arg_key ~* "apiTokenSecret") {
        return 403;
    }
    proxy_pass http://devtron-backend;
}