CVE-2025-32781: Apollo Portal Auth Bypass Vulnerability

CVE-2025-32781 Overview

CVE-2025-32781 is a missing authorization vulnerability in Apollo Portal, the management UI for the Apollo configuration management system used in microservice architectures. Versions prior to 2.5.0 fail to verify application and namespace permissions when an authenticated user requests a release by ID through GET /envs/{env}/releases/{releaseId} while configView.memberOnly.envs is enabled. A low-privileged Portal user who obtains or guesses a valid releaseId can read configuration data from other applications and namespaces. The flaw is classified under CWE-639 (Authorization Bypass Through User-Controlled Key). The issue is resolved in Apollo 2.5.0.

Critical Impact
Authenticated low-privileged users can read sensitive configuration data (including secrets stored in namespaces) belonging to unrelated applications by iterating release identifiers.

Affected Products

Apollo Portal (apolloconfig/apollo) versions prior to 2.5.0
Deployments with configView.memberOnly.envs enabled
Microservice environments relying on Apollo for configuration management

Discovery Timeline

2026-07-15 - CVE-2025-32781 published to NVD
2026-07-15 - Last updated in NVD database

Technical Details for CVE-2025-32781

Vulnerability Analysis

Apollo Portal exposes a REST endpoint at GET /envs/{env}/releases/{releaseId} that returns release metadata and configuration items for a specific release. The endpoint enforces authentication but omits the per-resource authorization check that other release-related endpoints perform. When the operator enables configView.memberOnly.envs to restrict configuration visibility to application members, this endpoint bypasses the restriction entirely.

An authenticated Portal user only needs a valid numeric releaseId to retrieve the associated configuration payload. Because release IDs are sequential integers, enumeration is straightforward. The returned data includes key-value pairs stored in the target namespace, which frequently contain database credentials, API keys, and other secrets.

Root Cause

The controller method backing the endpoint did not invoke UserPermissionValidator.shouldHideConfigToCurrentUser(...) before returning the release object. Authorization checks depended on the calling controller, and this particular path lacked the guard. The fix adds an explicit permission check based on the release's appId, env, clusterName, and namespaceName.

Attack Vector

Exploitation requires network access to the Apollo Portal and valid low-privileged credentials. The attacker issues authenticated HTTP GET requests against /envs/{env}/releases/{releaseId}, incrementing the release identifier to enumerate configurations from arbitrary applications and namespaces. No user interaction and no elevated privileges are needed.

java

    if (release == null) {
      throw NotFoundException.releaseNotFound(releaseId);
    }
+   if (userPermissionValidator.shouldHideConfigToCurrentUser(release.getAppId(), env,
+       release.getClusterName(), release.getNamespaceName())) {
+     throw new AccessDeniedException("Access is denied");
+   }
    return release;
  }

Source: Apollo commit 362735d. The patch inserts the missing authorization check into ReleaseController so unauthorized retrieval throws AccessDeniedException.

Detection Methods for CVE-2025-32781

Indicators of Compromise

Repeated authenticated GET /envs/{env}/releases/{releaseId} requests from a single Portal user against sequential release identifiers.
Portal audit log entries showing a user reading releases tied to applications where they are not listed as a member.
Anomalous data volume in Portal HTTP responses for release retrieval endpoints outside normal working patterns.

Detection Strategies

Correlate the requesting user's application membership against the appId of each retrieved release; flag mismatches.
Baseline the number of unique releaseId values queried per user per hour and alert on sudden enumeration bursts.
Inspect access logs for high 200-response counts on /envs/*/releases/* paths lacking prior navigation to the related application page.

Monitoring Recommendations

Enable and centralize Apollo Portal access logs, including authenticated user identity and requested URI.
Forward Portal logs to a SIEM or data lake for enumeration-pattern queries and long-term retention.
Monitor for privilege changes and new low-privileged accounts created shortly before spikes in release lookups.

How to Mitigate CVE-2025-32781

Immediate Actions Required

Upgrade Apollo Portal to version 2.5.0 or later, which introduces the missing permission check.
Audit Portal user accounts and revoke access for accounts that are no longer needed or exhibit suspicious release enumeration.
Rotate secrets and credentials stored in Apollo namespaces if unauthorized access is suspected.

Patch Information

The fix is included in Apollo 2.5.0. See the GitHub Release v2.5.0, the GitHub Pull Request #5378, the security advisory GHSA-jxpj-9j24-w337, and the remediation commit 362735d for details.

Workarounds

Restrict network access to the Apollo Portal so only trusted administrative networks can reach the release endpoints.
Place the Portal behind an authenticating reverse proxy that enforces application-scoped access control on /envs/*/releases/* paths.
Minimize secrets stored directly in Apollo namespaces by referencing an external secrets manager until the upgrade is applied.

bash

# Verify installed Apollo Portal version and upgrade
curl -sS http://<portal-host>/health
# Pull the fixed release
git clone --branch v2.5.0 https://github.com/apolloconfig/apollo.git
cd apollo && ./scripts/build.sh