x-stream · xstream
A Server-Side Request Forgery flaw in the XStream Java library (product xstream, versions before 1.4.15) can be triggered during unmarshalling of XML data.
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.15, a Server-Side Forgery Request vulnerability can be activated when unmarshalling. The vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.15. The reported vulnerability does not exist if running Java 15 or higher. No user is affected who followed the recommendation to setup XStream's Security Framework with a whitelist! Anyone relying on XStream's default blacklist can immediately switch to a whilelist for the allowed types to avoid the vulnerability. Users of XStream 1.4.14 or below who still want to use XStream default blacklist can use a workaround described in more detailed in the referenced advisories.
Public exploit code (PoC-in-GitHub) appeared 37 days after disclosure. No confirmed exploitation is recorded.
7 fixes in xstream over 22 months. The latest fix listed for xstream is 1.4.16.
No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
1 package in 1 ecosystem. Main package: com.thoughtworks.xstream:xstream.
Upgrade to 1.4.18 or later
Fixes this CVE and 12 other known vulnerabilities in this package (CVE-2013-7285, CVE-2019-10173, +10).
Set the version to 1.4.18 or later in your pom.xml or build.gradle.
First fixed in 1.4.15 for CVE-2020-26258.
| If you run | Upgrade to |
|---|---|
| All versions before 1.4.15 | 1.4.18first fix for this CVE: 1.4.15 |
“Up to” means the second version is the fix and is not affected.