CVE-2026-24748 Overview
CVE-2026-24748 is an authorization bypass vulnerability in Kargo, an open-source platform that manages and automates the promotion of software artifacts in Kubernetes environments. The vulnerability affects the authentication checks on the GetConfig() API endpoint, allowing unauthenticated users to access this endpoint by specifying an Authorization header with any non-empty Bearer token value, regardless of its validity.
This flaw enables attackers to exfiltrate configuration data such as endpoints for connected Argo CD clusters, potentially allowing enumeration of cluster URLs and namespaces for use in subsequent attacks. Additionally, the same authentication bypass affects the RefreshResource endpoint, which could be leveraged for denial-of-service attacks against the Kargo API.
Critical Impact
Unauthenticated attackers can access sensitive configuration data including Argo CD cluster endpoints and namespaces, and perform denial-of-service attacks against the Kargo API by abusing the RefreshResource endpoint.
Affected Products
- Kargo versions prior to 1.8.7
- Kargo versions prior to 1.7.7
- Kargo versions prior to 1.6.3
Discovery Timeline
- 2026-01-27 - CVE CVE-2026-24748 published to NVD
- 2026-01-29 - Last updated in NVD database
Technical Details for CVE-2026-24748
Vulnerability Analysis
The vulnerability stems from improper authorization (CWE-863) in Kargo's API authentication middleware. The affected endpoints fail to properly validate Bearer tokens, accepting any non-empty token string as valid authentication. This allows unauthenticated attackers to bypass access controls entirely by simply providing a fabricated Authorization header.
The GetConfig() endpoint exposes sensitive configuration data when exploited. This data includes connection details for Argo CD clusters, which attackers can use to map out the target infrastructure and identify potential attack surfaces for subsequent exploitation attempts.
The RefreshResource endpoint, while not exposing sensitive data directly, presents a denial-of-service vector. When called, this endpoint sets annotations on Kubernetes resources to trigger reconciliations. An attacker running requests in a loop could degrade API performance and impact legitimate operations on both the Kargo API and the underlying Kubernetes API server.
Root Cause
The root cause is improper authorization logic in Kargo's authentication middleware. The code responsible for validating Bearer tokens fails to properly verify token authenticity, instead only checking for the presence of a non-empty token value. This violates the principle of proper access control, where authentication tokens must be cryptographically verified before granting access to protected resources.
Attack Vector
The attack vector is network-based and requires no user interaction or prior authentication. An attacker can exploit this vulnerability by sending HTTP requests to the vulnerable endpoints with a crafted Authorization: Bearer <any-non-empty-value> header. The attack can be performed remotely against any exposed Kargo API instance.
For the configuration disclosure attack, the attacker targets the GetConfig() endpoint to retrieve Argo CD cluster connection details. For the denial-of-service attack, the attacker sends repeated requests to the RefreshResource endpoint, causing excessive reconciliation cycles that degrade system performance.
The vulnerability mechanism involves bypassing authentication checks by providing any non-empty Bearer token in the Authorization header. When the Kargo API receives such a request, the flawed authentication logic accepts the token without validating its cryptographic signature or checking against known valid tokens. See the GitHub Security Advisory for complete technical details.
Detection Methods for CVE-2026-24748
Indicators of Compromise
- Unusual or excessive HTTP requests to /api/config or GetConfig endpoints from unknown IP addresses
- High volume of requests to RefreshResource endpoint indicating potential DoS attempts
- API access logs showing successful authentication with malformed or suspicious Bearer tokens
- Increased Kubernetes reconciliation activity without corresponding legitimate user operations
Detection Strategies
- Monitor API access logs for requests to GetConfig() and RefreshResource endpoints with unusual Authorization headers
- Implement rate limiting detection to identify potential DoS attempts against the RefreshResource endpoint
- Deploy network intrusion detection rules to flag requests with suspicious Bearer token patterns
- Audit Kubernetes resource annotation changes for unexpected reconciliation triggers
Monitoring Recommendations
- Enable detailed logging on Kargo API endpoints to capture Authorization header contents
- Set up alerts for abnormal API request rates, particularly to configuration-related endpoints
- Monitor Kubernetes API server performance metrics for degradation that may indicate ongoing exploitation
- Review Argo CD cluster access patterns for unauthorized enumeration attempts
How to Mitigate CVE-2026-24748
Immediate Actions Required
- Upgrade Kargo to version 1.8.7, 1.7.7, or 1.6.3 depending on your current version branch
- Review API access logs for evidence of exploitation prior to patching
- Implement network-level access controls to restrict Kargo API access to trusted sources
- Rotate any credentials or secrets that may have been exposed through the configuration endpoint
Patch Information
Akuity has released security patches addressing this vulnerability in Kargo versions 1.8.7, 1.7.7, and 1.6.3. The patches correct the authentication validation logic to properly verify Bearer tokens before granting access to protected endpoints.
Relevant commits:
For complete details, refer to the GitHub Security Advisory GHSA-w5wv-wvrp-v5m5.
Workarounds
- No workarounds are available for this vulnerability; patching is required
- As a temporary mitigation, restrict network access to the Kargo API to trusted IP ranges only
- Deploy a reverse proxy or API gateway to implement additional authentication before traffic reaches Kargo
- Monitor and rate-limit requests to sensitive endpoints until patching is complete
# Network access restriction example using kubectl
# Restrict Kargo API service to internal cluster traffic only
kubectl patch svc kargo-api -n kargo \
--type='json' \
-p='[{"op": "replace", "path": "/spec/type", "value": "ClusterIP"}]'
# If using ingress, implement IP allowlisting
# Example nginx ingress annotation
kubectl annotate ingress kargo-ingress -n kargo \
nginx.ingress.kubernetes.io/whitelist-source-range="10.0.0.0/8,172.16.0.0/12"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
