CVE-2026-71563: Apache Answer: MCP Answer Retrieval Exposes Content from Non-Public Questions

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-19 · updated 2026-10-20
Weakness: CWE-862

Description

Missing Authorization vulnerability in Apache Answer. This issue affects Apache Answer: through 2.0.2. An authorization flaw in the MCP answer retrieval tool allows holders of a global API key to access answer content associated with hidden, deleted, or pending-review questions. Users are recommended to upgrade to version 2.0.3, which fixes the issue.

Affected products

Apache Software Foundation Apache Answer: through 2.0.2

References

https://lists.apache.org/thread/msodd7g2r6xdn9wpkpdp04m9g1jb2xtl
http://www.openwall.com/lists/oss-security/2026/10/16/27

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