EUVD-2026-75594
GHSA-f649-qj8x-m2x6
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Symlink TOCTOU race needs local file placement and timing (AV:L/AC:H) plus a low-priv Plesk account (PR:L); root takeover crosses privilege boundary (S:C) with full C/I/A impact.
Primary rating from Vendor (hackerone).
CVSS VectorVendor: hackerone
Lifecycle Timeline
2DescriptionCVE.org
A Time-of-check Time-of-use (TOCTOU) race condition leading to insecure symlink following in Plesk causes local privilege escalation to root via arbitrary file/directory ownership takeover.
AnalysisAI
Local privilege escalation to root affects the Backup Manager component of WebPros Plesk, where a time-of-check-to-time-of-use race condition during backup restore allows an attacker to abuse insecure symlink following and take ownership of arbitrary files or directories. A low-privileged Plesk account holder who wins the race can redirect a root-executed restore operation onto attacker-chosen paths, gaining full root control of the hosting server. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated low-privileged Plesk account (PR:L) with the ability to place/replace files in the Backup Manager restore working directory and to trigger a backup restore operation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.0 base score is 9.9 with a scope change (S:C), reflecting root-level confidentiality, integrity, and availability impact - the outcome is severe. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the fixed Plesk release as directed by the vendor advisory (https://support.plesk.com/hc/en-us/articles/43248932867351); the provided data does not include an exact patched version number, so confirm the target build directly with WebPros - patch available per vendor advisory, released patched version not independently confirmed here. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit Plesk installations and enumerate all accounts with Backup Manager access; identify which low-privileged users can trigger restore operations. …
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External POC / Exploit Code
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