CVE-2026-88000Public exploitNetwork attack vector

Server hang via cyclic chat deletion

Published Sep 9, 2026 · Updated Sep 9, 2026

Denial of service in Open WebUI 0.10.0 through 0.11.0 allows remote authenticated users to hang the server via message deletion. The deletion helper follows attacker-controlled childrenIds without recording visited messages, so a cyclic chat tree makes the synchronous request loop run forever. Any default-role account can store the cycle and trigger it against its own chat, blocking all requests until the process is killed.

CVSS severity6.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Open WebUI 0.10.0 through 0.11.0 allows remote authenticated users to hang the server via message deletion. The deletion helper follows attacker-controlled childrenIds without recording visited messages, so a cyclic chat tree makes the synchronous request loop run forever. Any default-role account can store the cycle and trigger it against its own chat, blocking all requests until the process is killed.

The record

CVE
CVE-2026-88000
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.10.0, < 0.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open WebUI · Open WebUIversion=>= 0.10.0, < 0.11.1

Published CVSS scores

6.5Open WebUICVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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