Critical Security Update for xmlrpc-c: Cross-Site Scripting Vulnerability
Summary
ALSA-2026:61316: Important: xmlrpc-c security update. Affects xmlrpc-c versions < 1.51.0-17.el9_8. Fixed in 1.51.0-17.el9_8. How to fix ↓
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Background
xmlrpc-c is a library that implements the XML-RPC protocol, allowing remote procedure calls over the Internet using XML and HTTP. It is widely used for enabling communication between different systems and applications. The library facilitates the encoding of RPC calls into XML documents, which are then transmitted to a remote server, where the response is also returned in XML format. This functionality makes xmlrpc-c a vital component for many web applications and services. However, it is susceptible to security vulnerabilities, such as the recent Cross-Site Scripting (XSS) issue, which can compromise the integrity and security of applications utilizing this library.
Vulnerability Detail
The vulnerability identified as CVE-2026-15928 is a Cross-Site Scripting (XSS) flaw found in the error page component of the xmlrpc-c library. This issue arises when user input is not properly sanitized, allowing an attacker to inject malicious scripts into the error messages displayed to users. If exploited, this vulnerability could lead to unauthorized actions being performed on behalf of users, data theft, or session hijacking. The potential impact is significant, especially for applications that rely on xmlrpc-c for remote procedure calls, as it can undermine user trust and application security.
How To Fix
Minimum fixed version
1.51.0-17.el9_8
This is the first release that contains the fix.
sudo dnf update xmlrpc-cTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, if immediate updating is not feasible, consider implementing input validation and output encoding in your application to sanitize user inputs and prevent XSS attacks. However, this is not a substitute for applying the official patch.
Conclusion
The xmlrpc-c library has a critical vulnerability that requires immediate attention. By updating to the latest patched version, users can protect their applications from potential exploitation. Regular monitoring and updates are essential for maintaining application security.
See every vulnerability recorded for xmlrpc-c →
FAQ
xmlrpc-c is a library that implements the XML-RPC protocol, enabling remote procedure calls over the Internet using XML and HTTP.
The vulnerability is a Cross-Site Scripting (XSS) flaw that allows attackers to inject malicious scripts into error messages displayed to users.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
Exploitation of this vulnerability can lead to unauthorized actions, data theft, and session hijacking, compromising user security and trust.
It is recommended to regularly check for updates and apply security patches promptly to protect your applications from vulnerabilities.
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