CVE-2026-88001 json
Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets
published 2026-09-09 1 mo ago modified 2026-09-14 55 d ago also GHSA-5x7x-4c3c-qf5w , PYSEC-2026-3878 , EUVD-2026-75187
- cvss
- 5.0
- 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 32%
- public exploits
- 0
- none known
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 until 0.11.1, server-side web fetches did not reapply WEB_FETCH_FILTER_LIST or private-address controls to HTTP redirect destinations when AIOHTTP_CLIENT_ALLOW_REDIRECTS was enabled. An authenticated user could redirect the aiohttp and requests fetch paths to excluded hosts, loopback, private networks, or cloud metadata services and route resulting content into web search, URL ingestion, page-fetch tools, or chat image processing. 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
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-5x7x-4c3c-qf5w referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
| OSV | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
| GitHub | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | >=0.9.5, <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-5x7x-4c3c-qf5w
exploit, web, vendor-advisory
-
github.com
/open-webui/open-webui/releases/tag/v0.11.1
web, release-notes
-
github.com
/open-webui/open-webui
package
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-5x7x-4c3c-qf5w
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-88001
advisory
Sources
- CVE List CVE-2026-88001
- GitHub Advisory GHSA-5x7x-4c3c-qf5w
- NVD CVE-2026-88001
- OSV PYSEC-2026-3878
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.