CVE-2026-68482: Apache Answer Authorization Bypass Flaw

CVE-2026-68482 Overview

CVE-2026-68482 is a missing authorization vulnerability in Apache Answer, an open-source question-and-answer platform. The flaw affects all versions through 2.0.2 and allows unauthenticated or unauthorized users to retrieve the invited-user list associated with non-public questions. The root cause is the absence of visibility authorization checks on the endpoint that returns invited users. Apache has released version 2.0.3 to address the issue. The vulnerability is categorized under [CWE-862] Missing Authorization.

Critical Impact

Unauthenticated attackers can enumerate the invited-user list of non-public questions in Apache Answer, exposing information intended to remain restricted.

Affected Products

• Apache Answer versions through 2.0.2
• Apache Answer deployments relying on invite-only (non-public) question visibility
• Self-hosted Apache Answer instances exposed to untrusted networks

Discovery Timeline

• 2026-10-19 - CVE-2026-68482 published to NVD
• 2026-10-19 - Last updated in NVD database

Technical Details for CVE-2026-68482

Vulnerability Analysis

Apache Answer supports non-public questions that limit visibility to a specific set of invited users. The platform exposes an endpoint that returns the list of users invited to a given question. In versions through 2.0.2, this endpoint does not verify whether the caller has permission to view the parent question. As a result, any requester, including unauthenticated clients, can request the invited-user list for a non-public question and receive the response.

The disclosed data includes identifiers of users invited to confidential discussions. Attackers can correlate this information with public profiles to map internal collaboration patterns, identify subject-matter experts, or build target lists for follow-on phishing and social engineering. The flaw does not enable modification of question content but breaks the confidentiality guarantee of invite-only questions.

Root Cause

The vulnerability stems from an authorization gap in the invited-user retrieval handler. The handler fetches and returns the invited-user list without first evaluating whether the requesting principal is authorized to access the associated non-public question. Authentication and visibility checks that gate the question itself are not propagated to this secondary endpoint, which classifies the issue as [CWE-862] Missing Authorization.

Attack Vector

Exploitation requires only network reachability to the Apache Answer HTTP interface. An attacker identifies a target non-public question identifier, then issues a request to the invited-user listing endpoint for that question. Because the endpoint does not enforce visibility controls, the server returns the invited-user list. The attack requires no credentials, no user interaction, and no elevated privileges. See the Apache Security Mailing List Thread and Openwall OSS Security Update for additional context.

Detection Methods for CVE-2026-68482

Indicators of Compromise

• Access-log entries showing requests to the invited-user listing endpoint for non-public question identifiers from unauthenticated sessions.
• High-volume or sequential enumeration of question identifiers against the invited-user endpoint originating from a single client.
• Requests to the invited-user endpoint lacking a valid session cookie or authorization header.

Detection Strategies

• Review Apache Answer HTTP access logs for requests targeting the invited-user API path and correlate with authentication state.
• Alert on anonymous or low-privilege sessions receiving successful 2xx responses from endpoints that return user data for non-public questions.
• Deploy web application firewall rules that flag or block unauthenticated requests to invited-user listing routes.

Monitoring Recommendations

• Forward Apache Answer application and reverse-proxy logs into a central analytics platform for query-based hunting.
• Baseline normal request rates to invited-user endpoints and alert on statistically significant deviations.
• Track outbound data volumes from the Apache Answer backend to detect bulk retrieval of invitation metadata.

How to Mitigate CVE-2026-68482

Immediate Actions Required

• Upgrade Apache Answer to version 2.0.3, which contains the official fix for the missing authorization check.
• Restrict network access to Apache Answer administrative and API endpoints until the upgrade is applied.
• Audit access logs for prior requests to the invited-user endpoint and identify any non-public questions whose invitation lists may have been exposed.

Patch Information

Apache has released Apache Answer 2.0.3 to remediate CVE-2026-68482. The fixed release adds visibility authorization checks to the invited-user retrieval path so that only authorized viewers of a non-public question can enumerate its invited users. Administrators should review the Apache Security Mailing List Thread for upgrade guidance and the Openwall OSS Security Update for the public disclosure record.

Workarounds

• Place Apache Answer behind an authenticated reverse proxy that blocks anonymous access to invited-user API routes until the upgrade is deployed.
• Avoid using the non-public question feature for sensitive invitations until all instances are running version 2.0.3.
• Apply web application firewall rules that require a valid authentication token on requests to invited-user listing endpoints.