# CVE-2026-121530: CVE-2026-121530

Status: published. Published: 2026-11-10. Updated: 2026-11-11.

A improper authentication vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6 may allow a remote authenticated attacker to gain improper access control via an invalid token after entering a valid username and password

## Remediation

- fix: Upgrade to FortiOS version 8.0.0 or above
Upgrade to FortiOS version 7.6.7 or above (source: CNA: fortinet)

## Affected products and versions

- Fortinet / FortiOS: ≥ 7.6.0; ≤ 7.6.6 (affected, semver). Source: CNA: fortinet

## Severity and prioritization

- CVSS 3.1: 5.9 (medium); CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C; source: CNA: fortinet

- CVSS 3.1: 6.6 (medium); CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H; source: NVD: psirt@fortinet.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

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

- Weaknesses: CWE-287

## Exploit evidence

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

## References

- https://fortiguard.fortinet.com/psirt/FG-IR-26-195 (CNA: fortinet)

- https://fortiguard.fortinet.com/psirt/FG-IR-26-195 (psirt@fortinet.com)

## Provenance

- CNA: fortinet: https://www.cve.org/CVERecord?id=CVE-2026-121530; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121530; retrieved 2026-11-11; source updated 2026-11-11

Revision: de91707f8e8488a80f3cae38149fc1415cce7ba6a3f1ec80ba167855b2dfd815

Canonical: https://y2.dev/cve/CVE-2026-121530

## 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.

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