Exploited vulnerability CISA KEV
CVE-2026-87886: Acronis Backup Incorrect Default Permissions Vulnerability
CVE-2026-87886 is a vulnerability in Acronis Backup that CISA added to its Known Exploited Vulnerabilities catalog on September 16, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 19, 2026.
CVE-2026-87886 is a vulnerability in Acronis Backup that CISA added to its Known Exploited Vulnerabilities catalog on September 16, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by September 19, 2026.
- CVE ID
- CVE-2026-87886
- Vendor / project
- Acronis
- Product
- Backup
- Added to KEV
- Due date
- Days to remediate
- 3
- Known ransomware use
- Unknown
- Weakness
- CWE-276
CISA description #
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.
Notes and references #
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
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