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Vulnerability details: VCID-7j5a-pu4k-kucf
Vulnerability ID VCID-7j5a-pu4k-kucf
Aliases CVE-2025-63681
GHSA-frv8-gffc-37px
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 3.9
Risk 1.9
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-284 Improper Access Control
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2025-63681
cvssv3.1_qr LOW https://github.com/advisories/GHSA-frv8-gffc-37px
cvssv4 2.1 https://github.com/open-webui/open-webui
generic_textual LOW https://github.com/open-webui/open-webui
cvssv3.1 4.3 https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
cvssv4 2.1 https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
generic_textual LOW https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
ssvc Track https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
cvssv3.1 4.3 https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
cvssv4 2.1 https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
generic_textual LOW https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
ssvc Track https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
cvssv4 2.1 https://nvd.nist.gov/vuln/detail/CVE-2025-63681
generic_textual LOW https://nvd.nist.gov/vuln/detail/CVE-2025-63681
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2025-63681
https://github.com/open-webui/open-webui
CVE-2025-63681 https://nvd.nist.gov/vuln/detail/CVE-2025-63681
GHSA-frv8-gffc-37px https://github.com/advisories/GHSA-frv8-gffc-37px
main.py#L1652 https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
report.md https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P Found at https://github.com/open-webui/open-webui
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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none

present

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none

passive

active

high

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none

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Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

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required

unchanged

changed

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P Found at https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

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none

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-12-05T19:50:21Z/ Found at https://github.com/open-webui/open-webui/blob/46ae3f4f5d7d4d706041bdae4ad2d802e568712b/backend/open_webui/main.py#L1652
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P Found at https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

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low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-12-05T19:50:21Z/ Found at https://github.com/TOAST-Research/pocs/blob/main/openwebui/arbitirary_task_stop/report.md
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P Found at https://nvd.nist.gov/vuln/detail/CVE-2025-63681
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

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low

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none
Exploit Prediction Scoring System (EPSS)
Percentile 0.04617
EPSS Score 0.00017
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T17:11:17.417660+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2025/63xxx/CVE-2025-63681.json 38.6.0