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CVE-2026-48797— Backpropagate: backprop ui --auth and backprop ui --share do not enforce authentication

Quick assessment

Affected
mcp-tool-shop-org backpropagate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP Tool Shop Backpropagate是MCP Tool Shop组织的一个大语言模型微调平台。 backpropagate 1.1.0版本和1.1.1版本存在安全漏洞，该漏洞源于Reflex web UI认证缺失，可能导致攻击者读取上传的数据集、触发任意训练运行、推送至HuggingFace Hub以及造成磁盘填满拒绝服务。

AI Predicted 9.8 Difficulty: Easy EPSS 0.57% · P45

Affected Version Matrix 2

VendorProduct Version RangeStatus
mcp-tool-shop-org @mcptoolshop/backpropagate >= 1.1.0, < 1.2.0 affected
mcp-tool-shop-org backpropagate >= 1.1.0, < 1.2.0 affected
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I. Basic Information for CVE-2026-48797

Vulnerability Information
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Vulnerability Title
Backpropagate: backprop ui --auth and backprop ui --share do not enforce authentication
Source: CVE Program / CVE List V5
Vulnerability Description
Backpropagate is a Python library for fine-tuning large language models on a single GPU. In versions 1.1.0 and 1.1.1, the optional Reflex web UI exposes a training control plane without authentication: dataset upload, model load, training start/stop, multi-run orchestration, GGUF export, and HuggingFace Hub push. The CLI accepts two operator-facing flags intended as security controls: --auth user:pass — documented as "require HTTP Basic authentication on every request to the UI." and--share — documented as "expose the UI on a public address; requires --auth." When --auth user:pass is passed, the CLI prints Auth: enabled (user: <username>) to confirm to the operator that authentication is active, then exports BACKPROPAGATE_UI_AUTH=user:pass to the subprocess that launches the Reflex backend. The Reflex backend (backpropagate/ui_app/**) never reads BACKPROPAGATE_UI_AUTH. No authentication middleware is registered. No request-level guard runs. No WebSocket upgrade guard runs. Any client that reaches the bound port — local or remote, depending on whether --share is used — has full UI access. An inline comment at backpropagate/cli.py:1217-1218 in the v1.1.0 source documents the gap: "For Phase 1 the variable is exported but Reflex doesn't read it yet." This comment was internal-facing; the user-facing documentation (README, CHANGELOG, SHIP_GATE) advertised the contract as enforced. An attacker who reaches the bound port can read uploaded datasets, trigger arbitrary training runs against any local base models as well as read their paths, trigger HuggingFace Hub pushes and cause disk-fill DoS. This issue has been fixed in version 1.2.0. If developers cannot immediately upgrade to 1.2.0 run backprop ui with no flags so it binds to localhost, use SSH port-forwarding (ssh -L 7860:localhost:7860 <training-host>) instead of --share for remote access, and audit any host previously launched with --share, re-issuing any HF tokens used during those sessions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当实现的标准安全检查
Source: CVE Program / CVE List V5
Vulnerability Title
MCP Tool Shop Backpropagate 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Tool Shop Backpropagate是MCP Tool Shop组织的一个大语言模型微调平台。 backpropagate 1.1.0版本和1.1.1版本存在安全漏洞，该漏洞源于Reflex web UI认证缺失，可能导致攻击者读取上传的数据集、触发任意训练运行、推送至HuggingFace Hub以及造成磁盘填满拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mcp-tool-shop-org backpropagate >= 1.1.0, < 1.2.0 -
mcp-tool-shop-org @mcptoolshop/backpropagate >= 1.1.0, < 1.2.0 -

II. Public POCs for CVE-2026-48797

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III. Intelligence Information for CVE-2026-48797

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Patches & Fixes for CVE-2026-48797 (1)

Vendor Advisories for CVE-2026-48797 (1)

IV. Related Vulnerabilities

Same weakness: CWE-358

V. Comments for CVE-2026-48797

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