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HighPublic exploit

Sandbox Escape RCE in alf.io Extension Script Engine

IdentifiersCVE-2026-35482CWE-863· Incorrect Authorization

CVE-2026-35482 is a sandbox escape vulnerability in the alf.io extension script engine affecting versions prior to 2.0-M5-2606. alf.io executes restricted JavaScript extensions inside a sandboxed Rhino environment, but the sandbox can be bypassed due to a combination of an unguarded injected Java object, returnClass, and an incomplete AST blocklist. These weaknesses allow an authenticated administrator to use Java reflection to escape the intended restrictions without triggering validation errors and ultimately execute arbitrary operating system commands on the underlying server.

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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 an authenticated administrator to break out of the Rhino JavaScript sandbox and achieve arbitrary OS command execution on the alf.io server. This can result in full compromise of the application host, including unauthorized access to sensitive data, modification of application state and server-side resources, deployment of additional payloads, service disruption, and potential lateral movement from the affected system.

Mitigation

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

If immediate upgrade is not possible, reduce exposure by restricting or disabling use of the extension script engine where feasible and tightly limiting administrator access to trusted users only. Monitor for creation or modification of extension scripts and for suspicious child-process execution from the alf.io application context. Network and host-level controls that constrain the alf.io process may reduce impact, but they do not remediate the underlying flaw.

Remediation

Patch, then assume compromise.

Upgrade alf.io to version 2.0-M5-2606 or later, which patches the sandbox escape condition in the extension script engine. Because the flaw enables arbitrary command execution on the server, organizations should treat vulnerable instances as high risk and prioritize patching. If exploitation is suspected, review administrator activity and server integrity for signs of malicious extension scripts or post-exploitation activity.
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.

ACTIVITY FEED

Recent activity

7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

7 SOURCESView more in app
What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

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 activity6

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-35482
NVD
nvd.nist.gov/vuln/detail/CVE-2026-35482
MITRE CWE · CWE-863
Incorrect Authorization
github.com
github.com/alfio-event/alf.io/security/advisories/GHSA-3w8f-mcf6-cm7h