VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished CVSS 9.1 criticalEPSS 0.6% probability of exploitation in 30 days
Fortinet

CVE-2026-126156: A authorization bypass through user-controlled key vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail…

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
0.6%

EPSS score, percentile 51.5 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
9.1 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

Upgrade to FortiMail version 8.0.2 or above Upgrade to FortiMail version 7.6.7 or above Upgrade to FortiMail version 7.4.9 or aboveSolution from the CVE record.

CISA has set no required action, because the vulnerability is not in KEV.

No patch or vendor advisory is listed in the CVE record. Check Fortinet's advisories.

Which versions are affected?

Affected

  • 8.0.0 through 8.0.1
  • 7.6.0 through 7.6.6
  • 7.4.0 through 7.4.8
  • 7.2.0 through 7.2.9

Versions by product

Source: CISA KEV 2026.11.10, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

A authorization bypass through user-controlled key vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow an unauthenticated remote attacker to take over an arbitrary IBE recipient account via crafted HTTP requests.

Source: CVE List, as of . About the data.

What to do

Advisories and patches

No patch, vendor advisory or mitigation is listed in the CVE record. Check Fortinet's own security advisories for a fix, and compare your version with the affected versions below.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
Fortinet FortiMail
StatusVersions
Affected8.0.0 through 8.0.1
Affected7.6.0 through 7.6.6
Affected7.4.0 through 7.4.8
Affected7.2.0 through 7.2.9

Versions not listed are: unaffected.

Source: CVE List, as of . About the data.

Weakness

CWE-639

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published

References

1

Known exploited Fortinet vulnerabilities

  • CVE-2025-61624: Fortinet Multiple Products Path Traversal Vulnerability (added )
  • CVE-2026-104286: Fortinet FortiMail Path Traversal Vulnerability (added )
  • CVE-2025-25249: Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability (added )
  • CVE-2025-68686: Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (added )
  • CVE-2026-25089: Fortinet FortiSandbox OS Command Injection Vulnerability (added )