How broadly exploitable is this vulnerability?

The vulnerability is broadly exploitable wherever the Rucio WebUI is accessible to users. An attacker only needs the ability to craft a URL that triggers the vulnerable 500 error path and convince victims to click it. The most significant impact occurs against authenticated users with active sessions.

Does an attacker need to be authenticated to exploit this?

Not necessarily. The attacker can often exploit the reflected XSS path without authentication by constructing a URL that triggers an internal error using publicly reachable endpoints. However, to gain meaningful access (such as stealing valuable session tokens), the victim must be an authenticated user.

What is the safest general fix pattern for developers?

The safest pattern is to completely decouple user-facing error pages from raw server-side exception data. Use generic, static error templates and log detailed exception information server-side, while ensuring any dynamic data that must appear in an error page is passed through strict, context-aware encoding functions.

Severity:

HIGH RISK

(8.1)

Reflected Cross-Site Scripting (CWE-79) in Rucio WebUI 500 Error Handling

CVE-2026-25136

Published:

Feb 25, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-1004

Impact:

Session Hijacking and Account Compromise via Reflected XSS

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-1004

Impact:

Session Hijacking and Account Compromise via Reflected XSS

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

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Reflected Cross-Site Scripting (CWE-79) in Rucio WebUI 500 Error Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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