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CVE-2026-64637VulnerabilityPublished

Improper Privilege Management

Source GCVE Database

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Authoritative record:CVE-2026-64637· Critical 9.9

Not known to be exploited · CVSS 9.9 Critical : upgrade to 18.0.80.1 as a priority.

Data as of 7 Nov 2026, 23:24 UTC

CVSS 3.0 base score
9.9Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 18.0.80.1, 18.0.80
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Aug 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 7 Nov 2026.

What to do

Upgrade Plesk to 18.0.80.1; plesk/plesk to 18.0.80.

Affected software

ProductAffectedFixed in
WebProsPleskAffected
  • <18.0.80.1
Fixed in
  • 18.0.80.1
Pleskplesk/pleskpkg:deb/plesk/pleskOther threatsAffected
  • <18.0.80
Fixed in
  • 18.0.80

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Plesk to version 18.0.80 or later where this vulnerability is fixed. No alternative mitigations are indicated.

Description

A critical vulnerability in Plesk versions before 18.0.80 allows an authenticated reseller to escalate privileges and obtain an administrative session for the root user via the XML-RPC API. This improper privilege management flaw can lead to full system compromise.

References

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