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Apache Answer CVE-2026-64943

HIGH
2026-10-16
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Obtain read access to Answer application logs
  2. Delivery
    Locate logged plaintext API keys
  3. Exploit
    Extract active bearer credential
  4. Execution
    Replay token against Answer API
  5. Impact
    Impersonate user / access API data

Vulnerability Assessment

Exploitation Conditions

Exploitation requires the attacker to have read access to Apache Answer's application logs, because the vulnerability is that full API keys are recorded in plaintext in those logs on every authenticated request. There is no special product feature or non-default configuration toggle involved - logging occurs normally - but the attacker must reach the log data (via local filesystem access, a shared/centralized logging pipeline, a backup, or a compromised logging account). The recovered credential must still be an active, non-expired bearer token to be replayable. The log-access prerequisite is the dominant limiting factor: this is not remotely exploitable against the application's public interface by an unauthenticated internet attacker.

Impact

This is a genuinely low-priority issue, and the available signals are consistent on that point. No CVSS vector, EPSS score, KEV listing, or public POC is present in the input, so there is no evidence of active or likely exploitation (no public exploit identified at time of analysis). The core weakness is CWE-532 (Insertion of Sensitive Information into a Log File): Apache Answer through 2.0.2 writes full API keys to application logs on every authenticated request. The critical limiting factor is that exploitation is not a remote network attack against the application itself - it requires an actor who already has read access to the application's logs, which is a meaningful precondition that drastically narrows the realistic attacker population. The impact is primarily confidentiality (recovery and replay of active bearer credentials), which could then be chained into broader account compromise, but the vulnerability itself grants no direct remote code execution or integrity/availability impact. The vendor rated this LOW, which aligns with the log-access precondition. Key caveat: no official CVSS vector was provided, so authentication/attack-vector metrics cannot be confirmed from NVD - they are inferred here from the description only.

Exploit ScenarioDerived

An insider, a compromised log-aggregation account, or a third party with access to centralized logging (e.g., a SIEM, shared log directory, or misconfigured log export) reads the Apache Answer application logs and extracts full API keys recorded on authenticated requests. The attacker then replays a still-valid bearer token to impersonate the legitimate user and access the API. No public exploit code is required or known; the 'exploit' is simply reading logs and reusing the leaked credential.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet

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AnalysisAIv1 – Oct 16, 2026

Apache Answer 2.0.2 and earlier records full API keys in plaintext in application logs on every authenticated request, so anyone able to read those logs - via local filesystem access, a shared or centralized logging pipeline, a backup, or a compromised logging account - can recover active bearer tokens and replay them against the platform. The prerequisite of log read access is the dominant limiting factor: this is not exploitable against the public interface by an unauthenticated internet attacker, and no public exploit code or active exploitation has been identified at time of analysis. It is a genuinely low-priority credential-disclosure issue whose real-world severity depends on how widely Answer's logs are distributed and how long tokens remain valid.

RemediationAI

Upgrade to Apache Answer 2.0.3, which the vendor states fixes the issue (Vendor-released patch: 2.0.3). The upgrade alone does not undo prior exposure: because every authenticated request up to that point wrote a full, replayable bearer token into the log stream, treat all API keys issued or used on an affected deployment as compromised and rotate them immediately - the trade-off is that rotation breaks existing API integrations and automated clients until they are reconfigured with the new keys, so schedule it with integration owners. After rotation, purge or securely destroy historical log data containing the leaked tokens, including rotated archives, centralized log indices, SIEM copies, and backups; be aware that deletion may conflict with audit-retention policies, so scope the purge to records containing the key material where possible and document the exception. Until cleanup completes, tighten access controls on the log store - restrict filesystem permissions on the log directory, remove Answer logs from broadly readable shared pipelines, and restrict the logging service account - accepting that these are containment measures only while plaintext credentials remain present. Subscribe to the vendor site at https://answer.apache.org and monitor the oss-security disclosure thread at https://seclists.org/oss-sec/2026/q4/197 for any follow-up guidance or additional fixed versions.

Affected ProductsAI

Apache Answer through version 2.0.2 is affected; the vendor recommends upgrading to 2.0.3, the first release containing the fix. No CPE identifiers were supplied in the source data, so affected installations must be identified by product and version rather than by automated CPE matching - administrators should inventory any Apache Answer deployment running 2.0.2 or earlier, including container images, managed instances, and forks carrying the vulnerable logging code path. Vendor information is available at https://answer.apache.org and the originating disclosure is archived at https://seclists.org/oss-sec/2026/q4/197, with the CVE record at https://www.cve.org/CVERecord?id=CVE-2026-64943.

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Technical ContextAI · show details

The flaw is a classic sensitive-data-in-logs defect in the log-insertion class described by the advisory as insertion of sensitive information into log file (CWE-532); the CWE field was not populated in the source data, so the classification is taken from the vendor's own wording. Apache Answer is an open-source Q&A/knowledge-management platform, and its authenticated API surface uses bearer credentials in request headers. Because the application emits the complete API key into its normal log stream on every authenticated request rather than a redacted or hashed identifier, the log store becomes an unencrypted credential store. There is no non-default toggle involved: logging happens under standard configuration, so any deployment whose logs are shipped off-host, retained in a SIEM, or backed up is potentially affected. The assessed vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N confirms the low-privilege, local-access prerequisite and a confidentiality-only impact - integrity and availability are untouched, and the attacker must still hold a valid, unexpired token to replay it. The 15.7k-star project's typical deployment pattern (containerized, aggregated logs) means the practical exposure is governed by log-retention scope rather than by the application boundary.

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Severity by source

vuln.today AI 5.5 MEDIUM

Requires read access to log files (AV:L, PR:L) rather than remote app access; leaking replayable API keys is a high confidentiality impact with no direct integrity or availability effect.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Executive ViewAI

Why It Matters

Apache Answer 2.0.2 and earlier writes live API bearer tokens into application log files in plaintext, so any person, system, or vendor with read access to those logs can lift credentials that still work against the platform. Because no vendor patch is available, the organization's exposure is determined almost entirely by how far Answer logs travel - into centralized SIEM or observability platforms, backups, or managed-service accounts - and how long issued tokens remain valid. Leadership should treat this as a credential-hygiene and log-governance issue rather than an external attack path: no public exploit code or active exploitation has been identified at time of analysis, and an attacker without existing log access cannot reach the tokens remotely.

Business Impact: Medium
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: disable or reduce request-level/debug logging in Apache Answer so tokens are not written; apply redaction rules at the log shipper or collector to mask Authorization headers; restrict and audit read access to Answer logs, centralized logging platforms, backups, and third-party log-management accounts using least privilege; purge or re-tier historical logs and backup copies containing exposed tokens; rotate all API keys and bearer tokens and shorten token lifetime to limit replay value; monitor for token replay indicators such as new source IPs, geographies, or user agents on existing tokens. Transition to the vendor patch when a fixed version above 2.0.2 is released.

Threat Intelligence Overview

Prevalence
Low
self-hosted open-source Q&A platform, niche deployment footprint
Data Quality
1 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS N/A
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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