CVE-2026-70482 json
Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client
published 2026-08-04 3 mo ago modified 2026-11-03 5 d ago also GHSA-rq84-p6rr-vf89 , PYSEC-2026-3652 , EUVD-2026-52887
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 47%
- public exploits
- 0
- none known
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLE_OAUTH_TOKEN_EXCHANGE=True, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which OAuth client the token was issued to. Anyone holding an access token minted for any client registered with the same provider could exchange it for an Open WebUI session as that token user, including applications the operator does not control and has never authorized. 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
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 3 mo ago
Exploit prediction
0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| OSV | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | >=0.8.0, <0.11.0 |
0.11.0 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/open-webui/open-webui/commit/b190dcf3caa00dc8b7b9c7312828298d9143f60d
web, patch
-
github.com
/open-webui/open-webui/commit/c4332be71e6e9c314e8a13b9d2819a6932561630
web, patch
-
github.com
/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89
exploit, web, mitigation, 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-rq84-p6rr-vf89
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-70482
advisory
Sources
- CVE List CVE-2026-70482
- GitHub Advisory GHSA-rq84-p6rr-vf89
- NVD CVE-2026-70482
- OSV PYSEC-2026-3652
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