CVE-2026-107589 in Jacamar CI
Summary
by MITRE • 10/08/2026
Insufficient job validation for service accounts in Jacamar CI prior to v0.30.0 allows authenticated CI users to generate arbitrary account names.
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Analysis
by VulDB Data Team • 10/08/2026
The vulnerability identified in Jacamar Continuous Integration systems prior to version 0.30.0 represents a critical failure in input validation and identity management controls. Specifically, the system lacks sufficient job validation mechanisms for service accounts, which are typically used by automated processes rather than human users. This architectural oversight allows authenticated CI users to manipulate the account creation or assignment logic within the platform. By exploiting this flaw, an attacker can generate arbitrary account names that do not adhere to expected naming conventions or security policies. The core technical issue lies in the absence of strict sanitization and validation checks on the service account identifiers during their initialization or modification phases. This allows malicious actors to inject unexpected characters or patterns into these fields, potentially leading to confusion within downstream systems that rely on predictable identity structures for access control decisions.
From a security architecture perspective, this flaw aligns with CWE-20 Improper Input Validation and CWE-754: Improper Check for Unusual or Exceptional Conditions. The system fails to verify whether the provided service account name conforms to predefined constraints before accepting it into the active directory of CI jobs. This lack of validation creates a pathway for identity confusion, where legitimate processes might inadvertently interact with maliciously named entities, or conversely, attackers can create accounts that mimic privileged identities. In many CI/CD pipelines, service accounts are granted specific permissions based on their names or associated roles. By generating arbitrary names, an attacker may bypass role-based access control mechanisms if those controls rely partially on string matching rather than robust identity binding and cryptographic verification.
The operational impact of this vulnerability is significant for organizations relying on Jacamar CI for automated software delivery pipelines. An authenticated user with limited privileges can escalate their influence by creating service accounts that appear legitimate or privileged. This could lead to unauthorized execution of build jobs, leakage of sensitive artifacts stored in the pipeline, or manipulation of deployment configurations. Furthermore, if downstream systems trust these arbitrary account names without additional verification, it may result in privilege escalation across interconnected services. The ability to generate arbitrary names also complicates audit trails and forensic analysis, as logs may contain non-standard identifiers that are difficult to correlate with actual human users or authorized service definitions. This undermines the principle of least privilege by allowing entities outside the intended scope to operate within the CI environment under deceptive identities.
To mitigate this risk, organizations must upgrade Jacamar CI to version 0.30.0 or later, where these validation checks have been implemented and strengthened. Until an upgrade is feasible, administrators should enforce strict network segmentation to limit access to the CI interface only to trusted IP ranges and users with verified credentials. Additionally, implementing multi-factor authentication for all CI accounts adds a layer of defense against unauthorized exploitation. It is also advisable to review existing service account configurations and remove any that were created using non-standard naming conventions during the vulnerable period. Monitoring logs for unusual job executions or new account creations can help detect potential abuse early. Aligning with MITRE ATT&CK techniques, this vulnerability facilitates Initial Access via Valid Accounts and potentially Privilege Escalation through Identity Manipulation. Regular security assessments focusing on input validation in identity management modules are essential to prevent similar flaws from persisting in CI/CD infrastructure.