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TI-2026-76887 Aliases CVE-2026-90800GHSA-49pc-3x56-3wp6

Missing authorization in Apache CouchDB exposes prefixed system databases

Priority LOW 38CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Apache CouchDB versions from 0 before 3.5.3 are affected. Missing authorization checks in chttpd (CWE-862) let any request read the full contents of a prefixed _users or _replicator database through an unauthorized API endpoint. The source notes that prefixed system databases are very rare.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00633 50th percentileScored 2026-11-07
Fix Fixed Apache CouchDB (Apache Software Foundation): 3.5.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache CouchDBbefore 3.5.33.5.3Patch availableCNA
  • Apache CouchDB VendorApache Affected before 3.5.3 Fixed in 3.5.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:apache:couchdb:*:*:*:*:*:*:*:*——Apache
  • cpe:2.3:a:apache:couchdb:*:*:*:*:*:*:*:* Versions — — ·Apache

Remediation

Upgrade Apache CouchDB to version 3.5.3, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Apache CouchDB (Apache Software Foundation) Fixed in 3.5.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apache CouchDB 3.5.3

    6 records Highest priority Priority MEDIUM 2 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-76883 Unvalidated setting in Apache CouchDB allows OS command executionPriority MEDIUM 43
    • TI-2026-76884 Pre-authentication gzip decompression bomb in Apache CouchDBPriority MEDIUM 41
    • TI-2026-76901 Credential disclosure in Apache CouchDB replication endpointsPriority LOW 30
    Show all 6 records →

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-90800
  2. 2026-10-20 Weakness changed · CISA ADP
  3. 2026-10-20 CISA SSVC decision points changed
  4. 2026-10-20 Priority changed: MEDIUM → LOW
  5. 2026-10-21 Alias added: GHSA-49pc-3x56-3wp6
  6. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Advisory 1

Other 1

  • TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
  • TI-2024-30292 Apache OFBiz: Confused controller-view authorization logic (forced browsing) KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-26062 Apache OFBiz: Unauthenticated endpoint could allow execution of screen rendering code KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-21190 Apache OFBiz: Path traversal leading to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-18186 Apache HugeGraph-Server: Command execution in gremlin KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-25106 Deserialization of untrusted data in Apache ActiveMQ KEVCVSS 3.1CRITICAL 10.0
See all 4053 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences