VULNpocalypse

CVE-2026-102811: Marmite through 0.4.2 Unauthenticated API Access via Development Server

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

Marmite through 0.4.2 contains missing authentication in the development server endpoints /__marmite__/content, /__marmite__/config, and /__marmite__/file/, allowing unauthenticated attackers to create, modify, and overwrite site content and configuration. Attackers can exploit unsanitized path parameters in handle_create_content and handle_clone_content to write files outside the project directory via directory traversal.

Description quoted from the CVE record (assigned by VulnCheck, published 2026-09-29).

Weakness: Missing Authentication for Critical Function

How it can be exploited

Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and no user interaction. Impact: confidentiality none, integrity high, availability none. CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: partial.

Public exploit evidence (Exploit Observer)

Also known as: EUVD-2026-89111, GHSA-j4pw-7rqh-x2mj

VEDAS cluster: VEDAS:DILIGENTHORSE

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 (3)

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
0.007
low predicted chance of attack
VEDAS
0.989
strong exploit evidence
On CISA KEV
Not listed
Detection rule
Nuclei · Suricata

Who is affected

ProductAffectedNot affected
rochacbruno marmiteup to and including 0.4.2Not stated

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

How to fix it

Vendor guidance:

How to detect it

Nuclei template (active check)

Marmite Dev Server - Unauthenticated Configuration Disclosure

Marmite through 0.4.2 ships a development server (started with --serve) whose endpoints /__marmite__/content, /__marmite__/config and /__marmite__/file/ require no authentication, allowing unauthenticated attackers to read and overwrite site content and configuration (and to write outside the project directory via path traversal). A GET to /__marmite__/config returns a JSON object with the config file path and its raw YAML contents.

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

The template sends 1 request (GET /__marmite__/config); it decides using dsl matchers. Severity in the template: high. 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-2026-102811.yaml
Show the template (39 lines)
yaml
id: CVE-2026-102811

info:
  name: "Marmite Dev Server - Unauthenticated Configuration Disclosure"
  author: vedas-arpsyndicate
  severity: high
  description: |
    Marmite through 0.4.2 ships a development server (started with --serve) whose endpoints
    /__marmite__/content, /__marmite__/config and /__marmite__/file/ require no authentication,
    allowing unauthenticated attackers to read and overwrite site content and configuration
    (and to write outside the project directory via path traversal). A GET to
    /__marmite__/config returns a JSON object with the config file path and its raw YAML
    contents.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-102811&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=marmite&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
    cvss-score: 8.7
    cve-id: CVE-2026-102811
    cwe-id: CWE-306
  metadata:
    verified: false
  tags: cve,cve2026,marmite,exposure
http:
  - raw:
      - |
        GET /__marmite__/config HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(content_type, "application/json")'
          - 'contains(body, "\"file\"")'
          - 'contains(body, "\"yaml\"")'
        condition: and

CVE-2026-102811.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-102811 Marmite Dev Server - Unauthenticated Configuration Access Attempt. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2026-102811 Marmite Dev Server - Unauthenticated Configuration Access Attempt"; flow:established,to_server; http.uri; content:"/__marmite__/config"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2026-102811; reference:url,https://www.exploit.observer/?keyword=CVE-2026-102811&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=marmite&match=exact; sid:1081406; rev:1;)

CVE-2026-102811.rules on GitHub

References

Vendor advisories and patches

Exploits and technical analysis

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.