CVE-2026-48797Network attack vector

Unauthenticated training control via ignored authentication variable

Published Jun 16, 2026 · Updated Jun 16, 2026

Authentication bypass in MCP Tool Shop Backpropagate 1.1.0 through 1.1.1 allows remote attackers to control the Reflex web UI. The CLI exports BACKPROPAGATE_UI_AUTH and reports authentication as enabled, but the Reflex backend never reads the variable or registers HTTP or WebSocket guards. Exposure is host-local by default or network-reachable with --share; any client reaching the port can read datasets, start training, push models, and fill disk.

CVSS severity9.3
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in MCP Tool Shop Backpropagate 1.1.0 through 1.1.1 allows remote attackers to control the Reflex web UI. The CLI exports BACKPROPAGATE_UI_AUTH and reports authentication as enabled, but the Reflex backend never reads the variable or registers HTTP or WebSocket guards. Exposure is host-local by default or network-reachable with --share; any client reaching the port can read datasets, start training, push models, and fill disk.

The record

CVE
CVE-2026-48797
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
MCP Tool Shop
Product
Backpropagate
Classifications
CWE-1295, CWE-358, CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 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=>= 1.1.0, < 1.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MCP Tool Shop · Backpropagateversion=>= 1.1.0, < 1.2.0

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1295Debug Messages Revealing Unnecessary Information
CWE-358Improperly Implemented Security Check for Standard
CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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