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PatchSiren cyber security CVE debrief

CVE-2026-87886 Acronis CVE debrief

CVE-2026-87886 is a vulnerability in Acronis Backup, a product from Acronis, related to incorrect default permissions. The vulnerability allows attackers to exploit the system due to improper permission settings. Acronis has acknowledged the vulnerability and CISA has added it to their Known Exploited Vulnerabilities catalog. Defenders should assess exposure and apply mitigations according to vendor instructions to prevent potential exploitation. This vulnerability impacts organizations using Acronis Backup, particularly those with inadequate permission management.

Vendor
Acronis
Product
Backup
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2026-09-16
Original CVE updated
2026-09-16
Advisory published
2026-09-16
Advisory updated
2026-09-16

Who should care

Defenders responsible for Acronis Backup deployments, particularly those with inadequate permission management, should assess exposure and apply mitigations according to vendor instructions. This includes IT administrators, security teams, and operators who manage Acronis Backup systems. They should verify exposure, apply mitigations, and ensure compliance with CISA's BOD 26-04 guidance.

Why it matters

CVE-2026-87886 is a vulnerability in Acronis Backup related to incorrect default permissions. Defenders responsible for Acronis Backup deployments should assess exposure and apply mitigations according to vendor instructions to prevent potential exploitation.

  • Verify exposure of Acronis Backup deployments to this vulnerability
  • Apply mitigations according to Acronis instructions to prevent potential exploitation

Technical summary

The vulnerability is related to incorrect default permissions in Acronis Backup. This allows attackers to exploit the system due to improper permission settings. The technical impact is significant as it can lead to unauthorized access and potential data breaches. Defenders should prioritize verifying exposure and applying mitigations according to vendor instructions.

Defensive priority

Defenders should prioritize verifying exposure and applying mitigations according to vendor instructions.

Recommended defensive actions

  • Verify exposure of Acronis Backup to this vulnerability
  • Apply mitigations in accordance with Acronis instructions
  • Ensure compliance with CISA's BOD 26-04 guidance

Evidence notes

The vulnerability is noted in CISA's Known Exploited Vulnerabilities catalog and Acronis' official advisory. There is no evidence of public exploitation, but defenders should verify exposure and apply mitigations. The source item metadata and details are limited, and further verification is required to confirm affected scope and severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-87886 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-87886

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-87886 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-87886

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.