VULNpocalypse

CVE-2026-75601: Static Web Server: Authentication bypass on /metrics endpoint when --basic-auth is enabled

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

What it is

Static Web Server (SWS) is a production-ready web server suitable for static web files or assets. Through 2.43.0, instances with both basic-auth and metrics features enabled process the /metrics endpoint before the basic-auth check in src/handler.rs, allowing an unauthenticated remote attacker to retrieve Prometheus metrics that disclose virtual host names, request volumes, error rates, latency distributions, and active connections. This issue is fixed in version 2.44.0.

Description quoted from the CVE record (assigned by GitHub_M, published 2026-08-26).

Weakness: CWE-306: Missing Authentication for Critical Function

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and a user must take an action. Impact: confidentiality low, integrity none, availability none. CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CISA assessment (SSVC): CISA assesses that a public proof of concept exists. Automatable: no. Technical impact: partial.

Public exploit evidence (Exploit Observer)

Also known as: EUVD-2026-66709

VEDAS cluster: VEDAS:DEFIANTDUGONG

Exploit Observer links 5 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (5)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Vulnerability databases and vendor advisories (2)

Catalogue entries, not exploit evidence.

2 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS
0.004
low predicted chance of attack
VEDAS
0.987
strong exploit evidence
On CISA KEV
Not listed
Detection rule
Nuclei · Suricata

Who is affected

ProductAffectedNot affected
static-web-server static-web-serverversion < 2.44.0Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

How to fix it

No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.

How to detect it

Nuclei template (active check)

Static Web Server (SWS) - Unauthenticated Metrics Disclosure

Static Web Server (SWS) through 2.43.0, when both the basic-auth and metrics features are enabled, processes the /metrics endpoint before the basic-auth check in src/handler.rs. An unauthenticated remote attacker can retrieve the Prometheus metrics, disclosing virtual host names, request volumes, error rates, latency distributions and active connection counts. Fixed in 2.44.0, which enforces authentication first.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /metrics); it decides using dsl matchers. Severity in the template: medium. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2026-75601.yaml
Show the template (36 lines)
yaml
id: CVE-2026-75601

info:
  name: "Static Web Server (SWS) - Unauthenticated Metrics Disclosure"
  author: vedas-arpsyndicate
  severity: medium
  description: |
    Static Web Server (SWS) through 2.43.0, when both the basic-auth and metrics features
    are enabled, processes the /metrics endpoint before the basic-auth check in
    src/handler.rs. An unauthenticated remote attacker can retrieve the Prometheus metrics,
    disclosing virtual host names, request volumes, error rates, latency distributions and
    active connection counts. Fixed in 2.44.0, which enforces authentication first.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-75601&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=static-web-server&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
    cvss-score: 4.3
    cve-id: CVE-2026-75601
    cwe-id: CWE-306
  metadata:
    verified: false
  tags: cve,cve2026,static-web-server,sws,exposure,auth-bypass
http:
  - raw:
      - |
        GET /metrics HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "sws_http_", "# HELP")'
          - 'contains(content_type, "text/plain")'
        condition: and

CVE-2026-75601.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-75601 Static Web Server SWS - Unauthenticated Prometheus Metrics Disclosure. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-75601 Static Web Server SWS - Unauthenticated Prometheus Metrics Disclosure"; flow:established,to_client; file.data; content:"sws_http_requests_total"; nocase; fast_pattern; content:"# HELP"; classtype:web-application-attack; reference:cve,CVE-2026-75601; reference:url,https://www.exploit.observer/?keyword=CVE-2026-75601&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=static-web-server&match=exact; sid:1090201; rev:1;)

CVE-2026-75601.rules on GitHub

References

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.