Stored XSS in SolarWinds Serv-U Leading to Session Hijacking

Executive Summary

SolarWinds Serv-U versions 15.5.4 HF1 and earlier are affected by a stored cross-site scripting (XSS) vulnerability. This flaw allows attackers with authenticated access to inject malicious scripts into the application. These scripts could then be executed by other users, potentially leading to session hijacking or unauthorized information disclosure from administrator accounts.

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Detection Guidance

To detect this vulnerability, check if your SolarWinds Serv-U version is 15.5.4 HF1 or earlier. Compare your installed version against the patched version 2026.3. Review server logs for unusual script injections or unauthorized administrator account activities.

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Impact Analysis

If exploited, this vulnerability could allow attackers to hijack user sessions or steal sensitive information from administrator accounts. This may result in unauthorized access to critical systems, data breaches, or further compromise of the affected environment.

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Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Such incidents could result in legal penalties, fines, or reputational damage due to non-compliance with data protection standards.

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Mitigation Strategies

Immediately update SolarWinds Serv-U to version 2026.3 or later. If updating is not possible, restrict access to authenticated users only and monitor for suspicious activities. Remove any unnecessary administrator accounts to reduce attack surfaces.

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