VULNpocalypse

CVE-2026-54544: Fireshare has unauthenticated SSRF via missing login_required on webhook test endpoints

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

Fireshare facilitates self-hosted media and link sharing. Prior to version 1.6.16, two API endpoints that trigger outbound HTTP requests are missing the @login_required decorator. An unauthenticated attacker can call POST /api/test-discord-webhook or POST /api/test-webhook and cause the Fireshare server to issue an arbitrary HTTP POST to any URL the attacker supplies, including internal network addresses and cloud metadata services. No credentials, session cookies, or prior access are required. Version 1.6.16 contains a patch.

Description quoted from the CVE record (assigned by GitHub_M, published 2026-09-15).

Weakness: CWE-918: Server-Side Request Forgery (SSRF)

How it can be exploited

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

CISA assessment (SSVC): CISA assesses that a public proof of concept exists. Automatable: yes. Technical impact: partial.

Public exploit evidence (Exploit Observer)

Also known as: EUVD-2026-79948

VEDAS cluster: VEDAS:DESERTRUNNER

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
0.986
strong exploit evidence
On CISA KEV
Not listed
Detection rule
Nuclei · Suricata

Who is affected

ProductAffectedNot affected
ShaneIsrael fireshareversion < 1.6.16Not 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)

Fireshare - Server-Side Request Forgery

Fireshare prior to 1.6.16 exposes the API endpoints POST /api/test-webhook and POST /api/test-discord-webhook without the login_required decorator. An unauthenticated attacker can submit an attacker-controlled webhook_url in the JSON body and cause the Fireshare server to issue an outbound HTTP request to an arbitrary URL, including internal network addresses and cloud metadata services.

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

The template sends 1 request (POST /api/test-webhook); it confirms through an out-of-band callback (interactsh), so the scanner must be able to receive it; it decides using word 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-2026-54544.yaml
Show the template (38 lines)
yaml
id: CVE-2026-54544

info:
  name: "Fireshare - Server-Side Request Forgery"
  author: vedas-arpsyndicate
  severity: high
  description: |
    Fireshare prior to 1.6.16 exposes the API endpoints POST /api/test-webhook and
    POST /api/test-discord-webhook without the login_required decorator. An unauthenticated
    attacker can submit an attacker-controlled webhook_url in the JSON body and cause the
    Fireshare server to issue an outbound HTTP request to an arbitrary URL, including internal
    network addresses and cloud metadata services.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-54544&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=fireshare&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L
    cvss-score: 7.2
    cve-id: CVE-2026-54544
    cwe-id: CWE-918
  metadata:
    verified: false
  tags: cve,cve2026,fireshare,ssrf
http:
  - raw:
      - |
        POST /api/test-webhook HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"webhook_url":"http://{{interactsh-url}}/","video_url":"http://{{interactsh-url}}/","payload":"{}"}

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"

CVE-2026-54544.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-54544 Fireshare SSRF. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2026-54544 Fireshare SSRF"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/test-webhook"; nocase; http.request_body; content:"webhook_url"; nocase; content:"://"; distance:0; classtype:web-application-attack; reference:cve,CVE-2026-54544; reference:url,https://www.exploit.observer/?keyword=CVE-2026-54544&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=fireshare&match=exact; sid:1072400; rev:1;)

CVE-2026-54544.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.