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CVE-2026-45089— Dalfox: Unauthenticated Arbitrary File Create/Append via `output` Option in Dalfox Server Mode

Quick assessment

Affected
hahwul dalfox
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

dalfox是HAHWUL个人开发者的一款自动化跨站脚本扫描工具。 Dalfox 2.13.0之前版本存在代码问题漏洞，该漏洞源于REST API服务器模式中output、output-all和debug字段直接从攻击者请求体反序列化并传播到扫描引擎的日志路径，可能导致未认证的网络调用者创建或追加写入任意文件。

CVSS 8.2 · High EPSS 0.40% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
hahwul dalfox < 2.13.0 affected
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I. Basic Information for CVE-2026-45089

Vulnerability Information
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Vulnerability Title
Dalfox: Unauthenticated Arbitrary File Create/Append via `output` Option in Dalfox Server Mode
Source: CVE Program / CVE List V5
Vulnerability Description
Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is run in REST API server mode, the output, output-all, and debug fields in model.Options are JSON-tagged and deserialized directly from the attacker's request body, then propagated unchanged through dalfox.Initialize into the scan engine's logging path. The logger opens the attacker-supplied path with os.O_APPEND|os.O_CREATE|os.O_WRONLY and writes scan log lines to it. Critically, this file write block lives outside the IsLibrary guard in DalLog, so it executes even in server/library mode where file output was never intended to operate. Because no API key is required in the default configuration, an unauthenticated network caller can create or append to any file writable by the dalfox process on the host filesystem. This vulnerability is fixed in 2.13.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
dalfox 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
dalfox是HAHWUL个人开发者的一款自动化跨站脚本扫描工具。 Dalfox 2.13.0之前版本存在代码问题漏洞，该漏洞源于REST API服务器模式中output、output-all和debug字段直接从攻击者请求体反序列化并传播到扫描引擎的日志路径，可能导致未认证的网络调用者创建或追加写入任意文件。
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
hahwul dalfox < 2.13.0 -

II. Public POCs for CVE-2026-45089

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 11162 chars
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III. Intelligence Information for CVE-2026-45089

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Patches & Fixes for CVE-2026-45089 (1)

Vendor Advisories for CVE-2026-45089 (1)

Same Patch Batch · hahwul · 2026-05-27 · 4 CVEs total

CVE-2026-45087 10.0 CRITICAL Dalfox: Unauthenticated Remote Code Execution via `found-action` in Dalfox Server Mode
CVE-2026-45090 7.5 HIGH Dalfox: Unauthenticated Remote DoS via Closed-Channel Write in `ParameterAnalysis` (server
CVE-2026-45088 7.5 HIGH Dalfox: Unauthenticated Arbitrary File Read with Out-of-Band Exfiltration via `custom-payl

IV. Related Vulnerabilities

Same product: dalfox
Same vendor: hahwul
Same weakness: CWE-73

V. Comments for CVE-2026-45089

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