CVE-2026-70481 json
Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages
published 2026-08-04 3 mo ago modified 2026-09-18 51 d ago also GHSA-mj5r-jf49-m3w7 , PYSEC-2026-3649 , EUVD-2026-52882
- cvss
- 5.4
- 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 37%
- public exploits
- 0
- none known
Summary
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access is the same grant a member needs to post, any ordinary participant in a shared standard channel could rewrite or permanently delete another participant message, while group and direct message handlers enforced authorship. 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
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-mj5r-jf49-m3w7 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | >=0.5.0, <0.11.0 |
0.11.0 |
Affected products
- open-webui open-webui
Classification
References
-
github.com
/open-webui/open-webui/pull/27197
web, patch, vendor-advisory
-
github.com
/open-webui/open-webui/commit/c609ec41154fa092fa0af80d9d365de06b666286
web, patch
-
github.com
/open-webui/open-webui/security/advisories/GHSA-mj5r-jf49-m3w7
web, exploit, 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-mj5r-jf49-m3w7
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-70481
advisory
Sources
- CVE List CVE-2026-70481
- GitHub Advisory GHSA-mj5r-jf49-m3w7
- NVD CVE-2026-70481
- OSV PYSEC-2026-3649
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.