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CVE-2026-56843 is an incorrect authorization vulnerability in the XML-RPC API of WebPros Plesk affecting versions before 18.0.78.4. A low-privileged authenticated customer can query domain records they do not own because ownership checks are enforced only for certain lookup filters, and schema validation can be bypassed when using legacy XML protocol versions below 1.4.2.0. Successful exploitation enables cross-tenant access to domain-related data and disclosure of other tenants' FTP credentials, which are stored in cleartext. Those credentials can then be used to upload malicious content and potentially execute code as another tenant's system user.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication bypass vulnerability in Plesk.
An incorrect authorization vulnerability in the XML-RPC API of WebPros Plesk that allows a low-privileged authenticated customer to access other tenants' domain information and disclose cleartext FTP credentials, potentially enabling code execution as another tenant's system user.
A vulnerability in Plesk's XML API protocol that exposes cleartext FTP passwords, potentially enabling attackers to upload malicious files and achieve remote code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.