---
title: "CVE-2026-45087: Dalfox Server Mode Vulnerable to Unauthenticated Remote Code Execution via `found-action`"
url: https://erroneo.us/security/cve/CVE-2026-45087/
description: "CVE-2026-45087 (github.com/hahwul/dalfox/v2 (Go)): Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-27
date_modified: 2026-06-08
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-45087"
kev: false
cvss: 10
epss: 0.01386
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-45087: Dalfox Server Mode Vulnerable to Unauthenticated Remote Code Execution via `found-action`

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 1.4% , percentile 72: FIRST’s model estimates a 1.4% chance of exploitation activity in the next 30 days, higher than 72% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/hahwul/dalfox/v2 (Go) <= 2.12.0, fixed in 2.13.0 . Check your lockfile, including transitive dependencies.

## What it is

Dalfox is a powerful open-source XSS scanner and utility focused on automation. Prior to 2.13.0, when dalfox is started in REST API server mode (dalfox server), the server binds to 0.0.0.0:6664 by default and requires no API key unless the operator explicitly passes --api-key. Because model.Options — including FoundAction and FoundActionShell — is deserialized directly from attacker-supplied JSON in POST /scan, and because dalfox.Initialize explicitly propagates those two fields into the final scan options without stripping them, any unauthenticated caller who can reach the server port can supply an arbitrary shell command that the dalfox process will execute on the host whenever a scan finding is triggered. This vulnerability is fixed in 2.13.0.

## Affected packages

- Go `github.com/hahwul/dalfox/v2` <= 2.12.0 → fixed: 2.13.0

## Affected products (CVE record)

- hahwul dalfox: < 2.13.0

## Severity

- GitHub_M CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.39% probability of exploitation activity in the next 30 days; percentile 72.

## Sources

- [GitHub Advisory GHSA-v25v-m36w-jp4h](https://github.com/advisories/GHSA-v25v-m36w-jp4h)
- [CVE.org record CVE-2026-45087](https://www.cve.org/CVERecord?id=CVE-2026-45087)
- [NVD entry CVE-2026-45087](https://nvd.nist.gov/vuln/detail/CVE-2026-45087)
- [github.com](https://github.com/hahwul/dalfox/security/advisories/GHSA-v25v-m36w-jp4h)
- [github.com](https://github.com/hahwul/dalfox/releases/tag/v2.13.0)

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Source page: https://erroneo.us/security/cve/CVE-2026-45087/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt