VulnTideExploited vulnerabilities, by vendor. Data as of .
Known exploitedIn CISA's KEV catalog since Ransomware use: unknown
Acronis Backup

CVE-2026-87886: Acronis Backup Incorrect Default Permissions Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 1 day before the CVE record was published.

How likely is exploitation in the next 30 days?
0.2%

EPSS score, percentile 14.2 of all scored records

How severe?
7.8 High

CVSS v3.0 base score, given by the CNA

What should I do?

CISA deadline . Apply mitigations in accordance with vendor instructions … Full text

Advisories and patches (1)

Which versions are affected?

Affected

  • before 1.9.3.1021
  • before 1.8.11.638
  • before 1.2.3.238

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

What to do

Required action, set by CISA

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.

CISA due date for this action: .

Advisories and patches

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

Acronis Acronis Backup plugin for cPanel & WHM
StatusVersions
Affectedbefore 1.9.3.1021

Versions not listed are: unaffected.

Acronis Acronis Backup extension for Plesk
StatusVersions
Affectedbefore 1.8.11.638

Versions not listed are: unaffected.

Acronis Acronis Backup plugin for DirectAdmin
StatusVersions
Affectedbefore 1.2.3.238

Versions not listed are: unaffected.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

About this vulnerability

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

Summary: CISA's KEV catalog, as of .

  • CISA added CVE-2026-87886 to its Known Exploited Vulnerabilities (KEV) catalog on 16 Sep 2026.
  • CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
  • The due date CISA sets for the required action is 19 Sep 2026.
  • The CVE record was published on 17 Sep 2026, 1 day after it was added to KEV.
  • The CVE record carries a CVSS v3.0 base score of 7.8 (High), given by its CNA.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.2% (percentile 14.2), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

Weakness

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

Timeline

DateEvent
Added to CISA KEV
CVE record published
CVE record last updated
CISA due date for the required action

More exploited Acronis vulnerabilities

  • CVE-2023-45249: Acronis Cyber Infrastructure (ACI) Insecure Default Password Vulnerability (added )