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CVE-2026-12591VulnerabilityPublished

Zohocorp ManageEngine M365 Manager Plus versions below 4818 is affected by an authenticated technician may exploit

Source GCVE Database

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Authoritative record:CVE-2026-12591· Critical 9.9

Not known to be exploited · CVSS 9.9 Critical : upgrade to 4818 as a priority.

Data as of 12 Nov 2026, 10:19 UTC

CVSS 3.1 base score
9.9Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Zohocorp)CVSS 3.19.9
Patch
Available – fixed in 4818
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Upgrade M365 Manager Plus to 4818.

Affected software

ProductAffectedFixed in
ZohocorpM365 Manager PlusAffected
  • <4818
Fixed in
  • 4818

AI-suggested

If you cannot patch yet, restrict technician access and monitor administrative activities closely to mitigate risk.

Description

ManageEngine M365 Manager Plus versions below 4818 contain a vulnerability where an authenticated technician can exploit insufficient permission validation in the delegated administration interface to escalate privileges beyond their intended scope. This privilege escalation can lead to remote code execution during administrative processing. The vulnerability has a critical severity with a CVSS score of 9.9.

References

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