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Improper authorization enforcement in RustDesk FileTransfer sessions

IdentifiersCVE-2026-58056CWE-863

CVE-2026-58056 is an authorization flaw in RustDesk where incoming control messages are gated using per-capability flags instead of being strictly bound to the session's authorized connection type. In the vulnerable state, a session established with only FileTransfer authorization does not clear those capability flags. As a result, a peer that should be limited to file-transfer operations can send keyboard and mouse input events and invoke screenshot and display-capture handlers that are not properly restricted to the authorized session scope. The issue is therefore a privilege/scope enforcement failure that allows actions outside the permissions granted for the connection.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a peer with valid FileTransfer-only authorization to exceed intended permissions and interact with the remote system beyond file transfer. Specifically, the attacker can inject keyboard and mouse input and access screenshot/display-capture functionality. This can compromise integrity through unauthorized remote interaction and compromise confidentiality through capture of screen contents or display data. Depending on the remote session context, this may enable further abuse of the controlled host.

Mitigation

If you can’t patch tonight, do this now.

Until a patched release is deployed, restrict RustDesk usage to trusted peers and minimize issuance of FileTransfer authorizations to untrusted or unnecessary parties. Where operationally possible, disable or tightly control file-transfer-only sessions, monitor for unexpected keyboard/mouse activity or screenshot/display-capture requests originating from FileTransfer sessions, and use network- or policy-level controls to limit exposure of RustDesk services to approved endpoints only.

Remediation

Patch, then assume compromise.

Apply the vendor-provided fix and upgrade RustDesk to a patched release once available. The fix should ensure that authorization is enforced against the session's authorized connection type and that FileTransfer sessions clear or do not inherit control-related capability flags, preventing access to input-injection and capture handlers outside the granted scope.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
RustdeskRustdeskapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

7 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

7 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity7

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-58056
NVD
nvd.nist.gov/vuln/detail/CVE-2026-58056
MITRE CWE · CWE-863
cwe.mitre.org