CVE-2026-70491: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform

Q: How do I fix CVE-2026-70491?

open webui: upgrade to 0.11.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-70491 being exploited?

CVE-2026-70491 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-70491 affect?

CVE-2026-70491 affects open webui. Severity is medium (CVSS 6.5). Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py retu

Q: How urgent is CVE-2026-70491?

Priority 38/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-70491 is a medium-severity flaw (CVSS 6.5) affecting open webui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py returned full Python tool source to authenticated non-admin read-only users. ToolResponse deliberately omitted source and specs, but ToolUserResponse permitted extra fields and handlers spread a full tool model dum

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-08-04
Last modified	2026-09-18

Publisher (CNA): GitHub, Inc. · Vendor: openwebui

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-04 21:16 UTCPublished CVE record published
2026-09-18 14:47 UTCUpdated Record last modified

openwebui open webui UPGRADE

Affected: < 0.11.0

Fixed in: 0.11.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy open-webui || rpm -q open-webui || open-webui --version

2. UPGRADE to 0.11.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-webui

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-webui

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-70491?

open webui: upgrade to 0.11.0. Exact commands for each OS are on this page.

Is CVE-2026-70491 being exploited?

CVE-2026-70491 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-70491 affect?

CVE-2026-70491 affects open webui. Severity is medium (CVSS 6.5). Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/{id} endpoints in backend/open_webui/routers/tools.py retu

How urgent is CVE-2026-70491?

Priority 38/100. Public exploit reference

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-54020 MEDIUM 6.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70487 MEDIUM 5.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70488 MEDIUM 4.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70489 MEDIUM 6.5 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70490 MEDIUM 6.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform

References

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