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CVE-2020-26258— Server-Side Forgery Request can be activated unmarshalling with XStream

Quick assessment

Affected
x-stream xstream
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

XStream是XStream（Xstream）团队的一个轻量级的、简单易用的开源Java类库，它主要用于将对象序列化成XML（JSON）或反序列化为对象。 XStream 存在代码问题漏洞，该漏洞源于服务器端伪造请求漏洞可以在解组时激活。该漏洞可能允许远程攻击者可利用该漏洞通过操纵已处理的输入流从内部资源请求不能公开使用的数据。

CVSS 6.3 · Medium EPSS 81.82% · P100

Public Exploits 1

Nuclei · 1 CVE-2020-26258.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
x-stream xstream < 1.4.15 affected
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I. Basic Information for CVE-2020-26258

Vulnerability Information
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Vulnerability Title
Server-Side Forgery Request can be activated unmarshalling with XStream
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
XStream 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
XStream是XStream（Xstream）团队的一个轻量级的、简单易用的开源Java类库，它主要用于将对象序列化成XML（JSON）或反序列化为对象。 XStream 存在代码问题漏洞，该漏洞源于服务器端伪造请求漏洞可以在解组时激活。该漏洞可能允许远程攻击者可利用该漏洞通过操纵已处理的输入流从内部资源请求不能公开使用的数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
x-stream xstream < 1.4.15 -

II. Public POCs for CVE-2020-26258

# POC Description Source Link Shenlong Link
1 CVE-2020-26258 && XStream SSRF https://github.com/Al1ex/CVE-2020-26258 POC Details
2 XStream before 1.4.15 is susceptible to server-side request forgery. An attacker can request data from internal resources that are not publicly available by manipulating the processed input stream, thereby making it possible to obtain sensitive information, modify data, and/or execute unauthorized administrative operations. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-26258.yaml POC Details
3 None https://github.com/Threekiii/Awesome-POC/blob/master/%E5%BC%80%E5%8F%91%E6%A1%86%E6%9E%B6%E6%BC%8F%E6%B4%9E/XStream%20SSRF%20%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E6%BC%8F%E6%B4%9E%20CVE-2020-26258.md POC Details
4 None https://github.com/cuijiung/xstream-CVE-2020-26258 POC Details
5 None https://github.com/andikahilmy/CVE-2020-26258-xstream-vulnerable POC Details
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III. Intelligence Information for CVE-2020-26258

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Vendor Advisories for CVE-2020-26258 (4)

Mailing List Discussions for CVE-2020-26258 (9)

Security Blog Posts for CVE-2020-26258 (1)

IV. Related Vulnerabilities

Same product: xstream
Same vendor: x-stream
Same weakness: CWE-918

V. Comments for CVE-2020-26258

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