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CVE-2026-87886

HIGH
7.8
CVSS Score
Published: September 17, 2026 at 10:57 PM UTC
Updated: September 18, 2026 at 07:39 PM UTC
4 products affected across 1 vendorAcronis BackupBackup plugin for cPanel & WHMBackup extension for Plesk· also runs on 1 platform

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Severity
HIGH7.8
Exploitation
CISA KEV
Exploit prediction
EPSS 0.2%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score0.2%

EPSS (Exploit Prediction Scoring System) estimates a 0.2% chance this CVE is exploited in the wild within the next 30 days — higher than 14% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Acronis Backup plugin for cPanel & WHM and extension for Plesk contains an incorrect default permissions vulnerability that could allow for privilege escalation.

Required Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Ransomware Use
Unknown
Added to KEV
Sep 16, 2026
Remediation Due
Sep 19, 2026
37 days overdue
Notes
https://security-advisory.acronis.com/advisories/SEC-10986
BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
https://nvd.nist.gov/vuln/detail/CVE-2026-87886

Description

Local privilege escalation due to insecure file permissions. The following products are affected: Acronis Backup plugin for cPanel & WHM (Linux) before build 1.9.3.1021, Acronis Backup extension for Plesk (Linux) before build 1.8.11.638, Acronis Backup plugin for DirectAdmin (Linux) before build 1.2.3.238.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Acronis Backup· Acronis
95%
v < 1.2.3v < 1.8.11v < 1.9.31.9.31.9.3 hotfix11.9.3 hotfix2
Affected range stops below 1.2.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.8.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.9.3, so it looks safe — our inference, not a vendor statement
linux-linux-kernel (environment)
Backup extension for Plesk· Acronis
60%
v < 1.8.11.638
Affected range stops below 1.8.11.638, so it looks safe — our inference, not a vendor statement
Backup plugin for cPanel & WHM· Acronis
60%
v < 1.9.3.1021
Affected range stops below 1.9.3.1021, so it looks safe — our inference, not a vendor statement
Backup plugin for DirectAdmin· Acronis
60%
v < 1.2.3.238
Affected range stops below 1.2.3.238, so it looks safe — our inference, not a vendor statement

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisory
Source: cverecord
https://security-advisory.acronis.com/advisories/SEC-10986
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/know%20n-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87886
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87886

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHAcronis
Vector?

Quick Info

StatusANALYZED
CWE
CWE-276

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