Acronis Patches Exploited Vulnerability in cPanel Backup Plugin

Summary

Acronis has released patches for a critical vulnerability (CVE-2026-87886) in its Backup plugin for cPanel & WHM. The flaw, characterized by insecure file permissions, allows for local privilege escalation and has been actively exploited in targeted attacks. The vulnerability also affects the Backup extension for Plesk, though exploitation has not been observed there.

Full text

Acronis on Tuesday rolled out urgent patches for a vulnerability in the Backup plugin for cPanel & WHM that has been exploited in the wild. The Acronis Backup plugin for cPanel & WHM provides disk-level backup and recovery capabilities across hosting control panel environments. Insecure file permissions in the backup tool and in the Backup extension for Plesk can allow attackers to gain elevated privileges. The vulnerability is tracked as CVE-2026-87886 (CVSS score of 7.8) and has been exploited in the wild against the plugin, but not against the extension. “Exploitation of this vulnerability has been detected in the wild in limited, targeted attacks against Acronis Backup plugin for cPanel & WHM deployments,” Acronis notes in its advisory. The company says all Linux versions of the Backup plugin for cPanel & WHM before build 1.9.3.1021 and the Backup extension for Plesk before build 1.8.11.638 are affected.Advertisement. Scroll to continue reading. Acronis has not shared technical details on the vulnerability but urges users to update their deployments immediately. Related: Oracle Patches 800+ Vulnerabilities in September 2026 Security Update Related: ConnectWise Patches ScreenConnect Vulnerability Exploited in Worm-Like Attacks Related: Root RCE Zero-Day in Cisco Secure Email Gateway Under Active Exploitation Related: Critical cPanel & WHM Vulnerability Exploited as Zero-Day for Months Written By Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. Daily Briefing Newsletter Subscribe to the SecurityWeek Email Briefing for the latest cybersecurity threats, trends, and expert insights. More from Ionut Arghire 240,000 Hit by Data Breach at Japan’s Digital AgencyApple Patches 200 Vulnerabilities With New iOS 27, macOS Golden Gate 27 Releases Hacked HBO Max Reddit Account Used for Malware Delivery via ClickFix AttackPersonal, Financial Info Exposed in Revolut Data BreachChinese Hackers Exploit Critical Tencent Software Flaw for One-Click Code ExecutionThree JFrog Artifactory Flaws Exploited for Backdoor DeploymentConnectWise Patches ScreenConnect Vulnerability Exploited in Worm-Like AttacksBlueMoon Exploit Kit Chains Recent Chrome, Windows Zero-Days Latest News Enterprises Warned of Attacks Exploiting WSO2 VulnerabilityOracle Patches 800+ Vulnerabilities in September 2026 Security UpdateMicrosoft Commits to Sweeping AI Privacy Rules for Students. Will Other Tech Giants Follow?“We Think the Security Control Is Working” Is No Longer Good Enough$1 Million Sandbox Challenge Uncovers Linux Kernel FlawsExein Secures $270M at $1.7B Valuation for Physical AI SecurityTexas Utility CenterPoint Energy Confirms Breach After Hacker Leaks DataThai Broadband Provider Hacked via Fortinet Vulnerability Trending Daily Briefing NewsletterSubscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts. Virtual Event: Attack Surface Management Summit 2026 September 16, 2026 Join as speakers examine the various components of ASM strategy, the push to mandate continuous asset visibility and inventory tools, and the use of red-teaming, bug bounties and pen-tests in modern security programs. Register Webinar: Building Continuous Authorization at Scale September 23, 2026 Explore what it takes to operationalize continuous authorization at scale, including the technical, organizational, and cultural changes required. Register People on the MoveGeoff Belknap has joined HubSpot as Chief Trust Officer.Zero Networks has named Yossi Dagan as Chief Financial Officer.Manifold has appointed Joe Sullivan to its Board of Directors.More People On The MoveExpert Insights “We Think the Security Control Is Working” Is No Longer Good Enough Point-in-time audits and sampled assessments offer only snapshots; continuous control monitoring provides evidence that security controls are working today. (Sravish Sridhar) This Key Will Self-Destruct: An Open Standard for Revocable API Keys Every leaked credential should be dead, or dying, within sixty seconds of being found. Here's a proposal to make that the default. (Matt Honea) What the Hugging Face Incident Teaches Security Leaders About AI Agent Access Security teams must treat autonomous agents as highly privileged identities. (Etay Maor) The Future of AI-Driven Security Depends on Complete Data For twenty-five years, "data" in security meant logs and events. But logs are a lossy representation of reality. (Danelle Au) The MFA Identity Trap: When Authentication Creates a False Sense of Security Organizations must distinguish identity verification, authentication and threat detection, or risk successfully authenticating the attackers they are trying to stop. (Torsten George) Flipboard Reddit Whatsapp Whatsapp Email

Indicators of Compromise

• cve — CVE-2026-87886

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