open-webui v0.6.33 is vulnerable to Incorrect Access Control. The API /api/tasks/stop/ directly accesses and cancels tasks without verifying user ownership, enabling attackers (a normal user) to stop arbitrary LLM response tasks.
CVE-2025-63681
This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 98% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.3
- EG Score
- 4.3(medium)
- EPSS
- 18.0%
- KEV
- Not listed
Published
December 4, 2025
Last Modified
June 17, 2026
References (3)
- cve@mitrehttps://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
- cve@mitrehttps://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
- 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
Patch Availability(1)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| pip | open-webui | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| open-webui | 0.1.124 ... 0.6.9 (125 versions) | — | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 44× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-22 14:08 UTCEPSS rescore
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- 2026-05-29 18:24 UTCEG score recompute
- 2026-05-29 18:24 UTCGHSA enrichment
- 2026-05-29 13:44 UTCEPSS rescore
Related CVEs(same product + same CWE)
Same product
10 shownpip:open-webui
Same CWE
10 shownCWE-284
Frequently asked(5)
What is CVE-2025-63681?
When was CVE-2025-63681 disclosed?
Is CVE-2025-63681 actively exploited?
What is the CVSS score of CVE-2025-63681?
How do I remediate CVE-2025-63681?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-63681
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