Administrator session hijacking via stored script injection
Published Jul 21, 2026 · Updated Jul 21, 2026
Stored XSS in SolarWinds Serv-U 15.5.4 HF1 and earlier allows remote authenticated users to hijack administrator sessions. SolarWinds has not disclosed which management field stores the payload or where Serv-U later renders it without neutralization. Administrator-level access is required to plant the payload, and another user must view the affected page; resulting script execution can expose information or an administrator session.
Summary
What happened
Stored XSS in SolarWinds Serv-U 15.5.4 HF1 and earlier allows remote authenticated users to hijack administrator sessions. SolarWinds has not disclosed which management field stores the payload or where Serv-U later renders it without neutralization. Administrator-level access is required to plant the payload, and another user must view the affected page; resulting script execution can expose information or an administrator session.
The record
- CVE
- CVE-2026-28315
- Published
- Jul 21, 2026
- Updated
- Jul 21, 2026
- Vendor
- SolarWinds
- Product
- Serv-U
- Classifications
- CWE-79, CAPEC-63, T1539
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jul 21, 2026CVE publishedPublication date reported by the CVE source.
- Jul 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=15.5.4 HF1 and below
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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