CVE-2026-68969: 
Homebrew Schwachstellenanalyse und -minderung

CVE-2026-68969 is a sensitive information disclosure vulnerability in Apache Airflow where Variable values and Connection extra contents are written to the audit log in cleartext when submitted through bulk API endpoints (PATCH /api/v2/variables and PATCH /api/v2/connections). It affects all Apache Airflow versions prior to 3.3.1 and was publicly disclosed on August 12, 2026. This is a distinct code path from the related CVE-2026-50204 (fixed in 3.3.0), meaning deployments that already upgraded in response to that advisory remain vulnerable. The vulnerability carries a CVSS v3.1 base score of 6.5 (Medium) (GitHub Advisory, Apache Advisory).

The root cause is classified as CWE-532 (Insertion of Sensitive Information into Log File). Airflow's audit-log masking logic dispatches on top-level request field names (e.g., val/value for variables, extra for connections), but bulk API requests wrap entities two levels deep under actions[].entities[], so the masker never encounters a recognized key and records the payload verbatim. The fix introduced a _mask_bulk_entities helper that walks actions[].entities[] and applies existing per-entity masking before the body is logged, factoring out _mask_connection_entity and _mask_variable_entity so both single-entity and bulk paths share the same logic (GitHub PR #70890). Additionally, the Airflow UI's Import Variables action posts to the bulk endpoint, meaning any operator performing a routine variable import silently writes all secrets in the imported file to the audit log in cleartext (GitHub Advisory).

Any authenticated user with audit-log read access — regardless of whether they hold Variables or Connections read permissions — can recover cleartext secret values directly from the audit log. Connection extra fields are stored unencrypted in the log even though the connections table itself encrypts them, creating a persistent, unencrypted copy of sensitive credentials. The impact is limited to confidentiality (no integrity or availability impact), but exposed secrets such as database passwords, API keys, and cloud credentials could enable lateral movement or unauthorized access to downstream systems (GitHub Advisory, Apache Advisory).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation at the time of disclosure (Apache Advisory). The vulnerability requires authentication and audit-log read access, reducing the attack surface compared to unauthenticated flaws. The EPSS score is approximately 0.154%, indicating a low near-term exploitation probability (GitHub Advisory). The CVE is not listed in the CISA Known Exploited Vulnerabilities catalog.

1. Gain authenticated access: Obtain credentials for any Airflow account that has audit-log read access (this does not require Variables or Connections read permissions).
2. Trigger bulk endpoint logging: Either wait for another user to perform a bulk variable/connection update or import via the Airflow UI (Admin > Variables > Import Variables), or directly issue a PATCH /api/v2/variables or PATCH /api/v2/connections request with multiple entities containing sensitive values.
3. Access the audit log: Navigate to the Airflow UI audit log (Security > Audit Logs) or query the audit log API endpoint to retrieve recent log entries.
4. Extract cleartext secrets: Locate log entries corresponding to the bulk PATCH operations; the actions[].entities[] payload — including Variable values and Connection extra fields — will appear in cleartext, bypassing masking (GitHub PR #70890, GitHub Advisory).

• Logs: Audit log entries for PATCH /api/v2/variables or PATCH /api/v2/connections containing plaintext secret values within actions[].entities[] fields; audit log entries generated by the Import Variables UI action that include full variable file contents.
• Network: Unexpected or repeated API calls to PATCH /api/v2/variables or PATCH /api/v2/connections from unusual source IPs or user accounts; API calls to audit log read endpoints from accounts that do not normally access them.
• Logs: Access to the Airflow audit log API or UI by accounts that lack Variables/Connections read permissions but hold audit-log read access, which may indicate deliberate secret harvesting.

Upgrade to Apache Airflow 3.3.1 or later, which includes the fix from PR #70890 that applies per-entity masking to bulk audit-log entries (GitHub PR #70890, Apache Advisory). Deployments that previously upgraded to 3.3.0 in response to CVE-2026-50204 are still affected and must upgrade again. As interim mitigations: restrict audit-log read access to only authorized administrators, review existing audit logs for any exposed secrets, and rotate all credentials (Variable values and Connection extras) that may have been logged in cleartext.

The Apache Software Foundation issued a security advisory on August 12, 2026, explicitly noting that this vulnerability affects a different code path than CVE-2026-50204 and that users who already upgraded to 3.3.0 must upgrade again (Apache Advisory). The NixOS security tracker opened a tracking issue for Apache Airflow versions below 3.3.1 shortly after disclosure (GitHub PR #70890). No significant broader media coverage or notable researcher commentary beyond the official advisory and GitHub discussion has been observed.