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CVE-2020-26258 is a server-side request forgery vulnerability in XStream versions prior to 1.4.15. When XStream unmarshals attacker-controlled XML input while configured with its default blacklist-based Security Framework, an attacker can manipulate the object stream to cause the application to initiate requests to internal resources. Deployments using an explicit allowlist of permitted types are not affected, nor are deployments running on Java 15 or later.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository is a proof-of-concept exploit for CVE-2020-26258, a deserialization vulnerability in the XStream Java library (version 1.4.14). The structure includes a Maven project with a single Java entry point (Main.java) that deserializes a crafted XML file (CVE-2020-26258.xml) using XStream. The XML payload is designed to exploit the vulnerability by causing the Java process to make an outbound HTTP request to a controlled endpoint (https://eo9k3koijwh1jvr.m.pipedream.net), demonstrating the risk of SSRF or data exfiltration. The repository contains standard project files, IDE configuration, and the exploit code. The exploit demonstrates the vulnerability but does not provide a weaponized or customizable payload.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
XStream server-side request forgery vulnerability during unmarshalling.
An XStream server-side request forgery vulnerability triggered during unmarshalling.
A server-side request forgery vulnerability in XStream that can be activated during unmarshalling.
An SSRF vulnerability in XStream that can be activated during unmarshalling.
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.