CVE-2026-57954: Elide Authorization Bypass in Sort Expressions

Technical summary

CVE-2026-57954 is an authorization bypass in Elide's SortingImpl.getValidSortingRules method. The framework fails to enforce @ReadPermission annotations on sort expressions supplied by clients. An authenticated user can exploit this by requesting sorts on forbidden fields; the absence of permission validation allows the sort to execute, leaking field ordering information across all rows. The vulnerability does not require elevated privileges (PR:L indicates low privilege requirement), network isolation is bypassed (AV:N), and no user interaction is needed. The attack surface spans both JSON:API and GraphQL read operations, enabling inference-based information disclosure.

Business impact

This vulnerability creates a covert data leakage channel for systems using Elide to protect sensitive information. An attacker with valid API credentials—potentially obtained through phishing, supply chain compromise, or insider threat—can systematically probe for hidden or restricted fields and infer their values without direct access. In healthcare, financial, or PII-heavy applications, this could expose patient IDs, account balances, or confidential classifications. The CVSS score of 4.3 reflects that impact is limited to confidentiality (no integrity or availability loss) and requires authentication, but the ability to leak data across all rows in bulk makes this a meaningful privacy and compliance risk.

Affected systems

Elide framework versions through 7.1.17 are vulnerable. Deployments using Elide to serve APIs with JSON:API or GraphQL endpoints and relying on @ReadPermission to restrict field access are at risk. Applications that use Elide for internal tools, multi-tenant systems, or APIs with role-based access controls should be considered in scope. The vendor_products field in the source data is empty, so consult your Elide dependency tree and upgrade path against the official Elide release notes to confirm your exposure.

Exploitability

Exploitation requires valid API credentials (PR:L) but no special network position or user interaction. An attacker can craft sort requests programmatically and execute them at scale. The attack is deterministic and repeatable: by sorting on sequential or derived fields and analyzing result ordering, an attacker builds a map of hidden data. No special tools or zero-day knowledge is required; standard API clients suffice. The lack of CVSS attack complexity (AC:L) confirms this is straightforward to execute once the vulnerability is known.

Remediation

Upgrade Elide to a patched version that enforces @ReadPermission on sort expressions in SortingImpl.getValidSortingRules. Verify against the official Elide GitHub repository and advisory for the specific version that resolves this issue. As an interim mitigation, review and tighten @ReadPermission annotations on all model fields, and consider disabling sorting on sensitive fields at the API schema level if patches cannot be deployed immediately.

Patch guidance

Check the Elide project's releases page and security advisory for the first patched version after 7.1.17. Update your build.gradle, pom.xml, or equivalent dependency manager to pull the fixed version. Run your integration tests with a test suite that specifically exercises sorting on permission-denied fields to verify the patch is effective. If you maintain a private fork or customized Elide build, audit SortingImpl.getValidSortingRules in your codebase to ensure the permission check is in place.

Detection guidance

Monitor API logs for repeated sort requests on unusual or non-existent field names, particularly from single authenticated users or service accounts. Look for patterns like rapid iteration through field names or sorts on fields that rarely appear in normal application workflows. Implement runtime checks on sorting requests that log when a sort attempts a field marked with @ReadPermission restrictions. Consider deploying a WAF rule to rate-limit or block sort requests from a single user within short time windows if your threat model warrants it.

Why prioritize this

Although the CVSS score is MEDIUM (4.3), this vulnerability should be prioritized for patching because it enables information disclosure at scale without leaving obvious audit trails. Attackers can infer sensitive data quietly, and the flaw affects every authenticated user by default. Systems handling regulated data (HIPAA, PCI, GDPR) should treat this as high priority to avoid compliance violations and reputational risk.

Risk score, explained

The CVSS 3.1 score of 4.3 (MEDIUM) reflects: (1) confidentiality impact limited to inference-based leakage rather than direct reads, (2) authentication requirement (PR:L) reducing attack surface to valid users, (3) low attack complexity and network accessibility raising the floor above LOW, and (4) no integrity or availability impact. The score appropriately captures that this is a real but bounded privacy risk, not a critical system compromise. Context-specific risk may differ: a public-facing API is higher risk than an internal tool, and datasets with high PII density are higher risk than generic catalogs.

Frequently asked questions