# CVE-2026-84389: CVE-2026-84389

Status: published. Published: 2026-09-08. Updated: 2026-11-03.

A url redirection to untrusted site ('open redirect') vulnerability in Fortinet FortiSIEM 7.5.0 through 7.5.1, FortiSIEM 7.4.1 through 7.4.2 may allow attacker to execute unauthorized code or commands via <insert attack vector here>

## Remediation

- fix: Upgrade to upcoming  FortiSIEM version 7.6.0 or above
Upgrade to upcoming  FortiSIEM version 7.5.2 or above (source: CNA: fortinet)

## Affected products and versions

- Fortinet / FortiSIEM: ≥ 7.5.0; ≤ 7.5.1 (affected, semver); ≥ 7.4.1; ≤ 7.4.2 (affected, semver). Source: CNA: fortinet

## Severity and prioritization

- CVSS 3.1: 2.8 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C; source: CNA: fortinet

- CVSS 3.1: 3.1 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N; source: NVD: psirt@fortinet.com

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-03; percentile 12.35%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-601

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://fortiguard.fortinet.com/psirt/FG-IR-26-169 (CNA: fortinet)

- https://fortiguard.fortinet.com/psirt/FG-IR-26-169 (psirt@fortinet.com)

## Provenance

- CNA: fortinet: https://www.cve.org/CVERecord?id=CVE-2026-84389; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84389; retrieved 2026-11-04; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-84389; retrieved 2026-11-03; source updated Not reported

Revision: 7452220f99e38542ab2b0b18147101b7ff8d35bc7bdf48cd5d97af268b985e8a

Canonical: https://y2.dev/cve/CVE-2026-84389

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.