CVE-2026-70480 json
Open WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite chart rendering
published 2026-08-04 3 mo ago modified 2026-09-18 51 d ago also EUVD-2026-52916 , GHSA-rffm-9q57-q649 , PYSEC-2026-3651
- cvss
- 4.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.34 until 0.11.0, Open WebUI renders vega and vega-lite fenced code blocks in chat content by building a Vega view in the viewer browser without a restricted resource loader. Any user who can place such a block where another user will see it can make that user browser issue attacker-chosen outbound GET requests and read responses from same-origin or CORS-permissive targets into the rendered page. This issue is fixed in 0.11.0.
Patch / fix
- pypi open-webui 0.11.0
- openwebui open_webui 0.11.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N |
| GitHub | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N |
| OSV | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | >=0.6.34, <0.11.0 |
0.11.0 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/open-webui/open-webui/pull/26806
web, patch, vendor-advisory
-
github.com
/open-webui/open-webui/commit/5278eb906ebecefc6538a19bc86df09d997e43e6
web, patch
-
github.com
/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649
exploit, web, patch, vendor-advisory
-
github.com
/open-webui/open-webui/releases/tag/v0.11.0
web, release-notes
-
github.com
/open-webui/open-webui
package
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-rffm-9q57-q649
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-70480
advisory
Sources
- CVE List CVE-2026-70480
- GitHub Advisory GHSA-rffm-9q57-q649
- NVD CVE-2026-70480
- OSV PYSEC-2026-3651
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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.