CVE-2026-90800: Auth Bypass

Description

Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint. The use of prefixed system databases is very rare. Users are recommended to upgrade to version 3.5.3, which fixes this issue.

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Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other References

https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr http://www.openwall.com/lists/oss-security/2026/10/20/15

Frequently Asked Questions

What is CVE-2026-90800? +

Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint. The use of prefixed system databases is very rare. Users are recommended to upgrade to version 3.5.3, which fixes this issue.

How do I check if I'm vulnerable to CVE-2026-90800? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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