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Fencer Vulns
critical 10.0

CVE-2026-45087 json

Dalfox: Unauthenticated Remote Code Execution via `found-action` in Dalfox Server Mode

published 2026-05-12 5 mo ago modified 2026-10-26 14 d ago also GHSA-v25v-m36w-jp4h , GO-2026-5649 , EUVD-2026-32615

cvss
10.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
8.7%
EPSS 8.7% chance of exploitation in 30 days, percentile 95%
public exploits
1
Metasploit

Summary

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.

Patch / fix

  • go github.com/hahwul/dalfox/v2 2.13.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Timeline

  1. First public exploit (Metasploit exploit/linux/http/dalfox_server_rce_cve_2026_45087)
  2. Published

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
5 mo ago

Exploit prediction

8.73% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
GitHub 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/hahwul/dalfox/v2
<2.13.0
2.13.0
go github.com/hahwul/dalfox
all versions
 no fix listed

Affected products

  • hahwul dalfox

Classification

Weakness
  • CWE-15 External Control of System or Configuration Setting
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.