CVE-2026-90800— Apache CouchDB: Auth bypass in prefixed _users and _replicator databases
Quick assessment
Affected
Apache Software Foundation Apache CouchDB
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Apache CouchDB 3.5.2 及以下版本在所有平台上的 组件中缺少授权检查，导致任何请求均可通过未授权的 API 端点读取带有前缀的 或 数据库的完整内容。 带前缀的系统数据库使用场景极为罕见。 建议用户升级至 3.5.3 版本，该版本已修复此问题。
Possible ATT&CK Techniques 2 AI
T1003 · OS Credential Dumping T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-90800
Vulnerability Information
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Vulnerability Title
Apache CouchDB: Auth bypass in prefixed _users and _replicator databases
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache CouchDB | 0 ~ 3.5.3 | - |
|
II. Public POCs for CVE-2026-90800
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-90800 (2)
-
https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr vendor-advisory
Same Patch Batch · Apache Software Foundation · 2026-10-20 · 20 CVEs total
| CVE-2026-86471 | 9.3 CRITICAL | Apache CouchDB: Admin credentials leading to code execution as operating system user |
| CVE-2026-90797 | 7.7 HIGH | Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_session |
| CVE-2026-107755 | 6.0 MEDIUM | Apache CouchDB: Credential Disclosure to Non-Owner Members via Object-Form Replication End |
| CVE-2026-90799 | 1.3 LOW | Apache CouchDB: Atom-table exhaustion in _changes sequences and _search bookmarks with spe |
| CVE-2026-90798 | 0.6 LOW | Apache CouchDB: Replicator follows redirects indefinitely |
| CVE-2026-88041 | Apache Tomcat: HTTP/2 trailer header cross-contamination | |
| CVE-2026-103119 | Apache Tomcat: AJP response mix-up | |
| CVE-2026-101356 | Apache Tomcat: HTTP/2 request/response mix-up after error during async processing | |
| CVE-2026-101296 | Apache Tomcat: JNDIRealm bind credential validation fails open for non-GSSAPI SASL mechani | |
| CVE-2026-93446 | Apache Tomcat: Possible TLS 1.3 connection failures | |
| CVE-2026-86467 | Apache Airflow Amazon provider: AWS auth manager: SAML login CSRF logs users into the atta | |
| CVE-2026-80353 | Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets - Fix for | |
| CVE-2026-74049 | Apache Tomcat: Jasper JSTL <c:redirect> plug-in implementation omits page abort (SKIP_PAGE | |
| CVE-2026-74048 | Apache Tomcat: OpenSSL-FFM FIPS failure does not prevent start-up | |
| CVE-2026-108089 | Apache Cocoon: Unauthenticated access to diagnostic interfaces | |
| CVE-2026-108088 | Apache Cocoon: Cross-user cache poisoning | |
| CVE-2026-108087 | Apache Cocoon: SQL Injection | |
| CVE-2026-108086 | Apache Cocoon: XEE could lead to SSRF and information disclosure | |
| CVE-2026-92287 | Apache Arrow C++, PyArrow: Parquet file-controlled KMS URL is forwarded to pluggable KmsCl |
IV. Related Vulnerabilities
Same product: Apache CouchDB
-
CVE-2026-107755
Apache CouchDB: Credential Disclosure to Non-Owner Members v -
CVE-2026-90799
Apache CouchDB: Atom-table exhaustion in _changes sequences -
CVE-2026-90798
Apache CouchDB: Replicator follows redirects indefinitely -
CVE-2026-90797
Apache CouchDB: Pre-authentication gzip decompression bomb v -
CVE-2026-86471
Apache CouchDB: Admin credentials leading to code execution
Same vendor: Apache Software Foundation
-
CVE-2026-107755
Apache CouchDB: Credential Disclosure to Non-Owner Members v -
CVE-2026-90799
Apache CouchDB: Atom-table exhaustion in _changes sequences -
CVE-2026-90798
Apache CouchDB: Replicator follows redirects indefinitely -
CVE-2026-90797
Apache CouchDB: Pre-authentication gzip decompression bomb v -
CVE-2026-86471
Apache CouchDB: Admin credentials leading to code execution
V. Comments for CVE-2026-90800
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