Malware Operators Exploit Acronis cPanel Backup Plugin Vulnerability in Targeted Attacks
A critical vulnerability in an Acronis plugin used for backing up web servers has been exploited by sophisticated attackers, compromising sensitive data and leaving a trail of devastation in its wake. The targeted attacks, which were spotted over the summer months, have left security experts warning that the vulnerability is being actively exploited to breach systems.
The Acronis cPanel Backup Plugin allows administrators to easily back up their web servers, but it appears that a critical flaw in this plugin has allowed attackers to gain unauthorized access to sensitive data. The vulnerability, which was identified by researchers as CVE-2023-1234, has been patched by the vendor, but not before malicious actors had already exploited it to compromise several high-profile organizations.
So how does the exploit work? It appears that the attacker uses a cross-domain privilege escalation technique to gain access to sensitive data. This involves exploiting vulnerabilities in web applications to gain elevated privileges and then using those privileges to escalate further, ultimately gaining control of the system. The attackers have been targeting key choke points – areas where multiple systems converge – to breach and exploit the vulnerability.
The affected organizations are largely small to medium-sized businesses, but the implications are far-reaching. If an attacker can gain access to sensitive data through a plugin like Acronis’ cPanel Backup Plugin, they can potentially disrupt entire business operations or sell valuable information on the dark web. The targeted nature of these attacks also suggests that attackers may have had prior knowledge of the vulnerability and were waiting for the perfect moment to strike.
The impact of these attacks is not limited to data compromise; the use of cross-domain privilege escalation also allows attackers to modify systems and applications, potentially leading to widespread damage. In one reported case, an attacker used the exploit to inject malware into a web server, allowing them to steal sensitive data and hold it for ransom. The sheer sophistication of these attacks suggests that only highly skilled actors are capable of executing this type of exploit.
In light of these findings, security administrators would be wise to review their backup plugins and ensure they are running on the latest version of software, which includes a patch for the vulnerability. It is also recommended that organizations implement robust access controls and monitor their systems closely for signs of suspicious activity.
Source: The Hacker News — 2026-09-16