CVE-2026-87999 json
Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch
published 2026-09-09 1 mo ago modified 2026-10-01 38 d ago also GHSA-34r3-9m95-vq73 , PYSEC-2026-4116 , EUVD-2026-75184
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.1, POST /api/v1/retrieval/process/web and POST /api/v1/retrieval/process/web/search in backend/open_webui/retrieval/web/utils.py treated Python's globally routable address classification as proof that a destination was external. An authenticated user could make an Azure-hosted instance fetch and return content from 168.63.129.16, the Azure platform channel, as well as other reserved ranges that the standard classification did not reject. This issue is fixed in version 0.11.1.
Patch / fix
- pypi open-webui 0.11.1
- openwebui open_webui 0.11.1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 59 d ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-34r3-9m95-vq73 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N |
| OSV | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N |
| GitHub | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | <0.11.1 |
0.11.1 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/open-webui/open-webui/pull/27823
web, issue-tracking, patch
-
github.com
/open-webui/open-webui/commit/e3e4bd87df6fc629e7e22081d980d55a7632b8b7
web, patch
-
github.com
/open-webui/open-webui/security/advisories/GHSA-34r3-9m95-vq73
exploit, web, vendor-advisory
-
github.com
/open-webui/open-webui/releases/tag/v0.11.1
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-87999
advisory
-
github.com
/open-webui/open-webui
package
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-34r3-9m95-vq73
advisory
Sources
- CVE List CVE-2026-87999
- GitHub Advisory GHSA-34r3-9m95-vq73
- NVD CVE-2026-87999
- OSV PYSEC-2026-4116
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.