CVE-2026-23835Public exploitNetwork attack vector

Authenticated quota bypass via trusted upload metadata

Published Jan 30, 2026 · Updated Jan 30, 2026

Improper authorization in LobeChat before 1.143.3 allows remote authenticated users to bypass upload quotas and create files in unintended paths. The file.createFile tRPC procedure accepts client-supplied name, size, and object URL values and records the claimed size without reading S3 object metadata. A valid user session and completed object upload are required; falsified metadata enables cross-namespace placement and unmetered storage consumption that can degrade uploads for other users.

CVSS severityUnavailable
Unscored
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in LobeChat before 1.143.3 allows remote authenticated users to bypass upload quotas and create files in unintended paths. The file.createFile tRPC procedure accepts client-supplied name, size, and object URL values and records the claimed size without reading S3 object metadata. A valid user session and completed object upload are required; falsified metadata enables cross-namespace placement and unmetered storage consumption that can degrade uploads for other users.

The record

CVE
CVE-2026-23835
Published
Jan 30, 2026
Updated
Jan 30, 2026
Vendor
LobeHub
Product
LobeChat
Classifications
CWE-73, T1496
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 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=< 1.143.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LobeHub · LobeChatversion=< 1.143.3

Published CVSS scores

5.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-73External Control of File Name or Path
T1496Resource Hijacking

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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