CVE-2025-26391
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSolarWinds Observability Self-Hosted XSS Vulnerability. The SolarWinds Platform was susceptible to a XSS vulnerability that affects user-created URL fields. This vulnerability requires authentication from a low-level account.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceSolarWinds Observability Self-Hosted contains a stored Cross-Site Scripting (XSS) vulnerability in user-created URL fields. An attacker with low-level authentication can inject malicious scripts into URL parameters that are not properly sanitized when rendered, allowing execution in the context of other users' sessions.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 2025.4.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm SolarWinds Observability Self-Hosted is installedLocate the installation directory, check the admin UI for product information, or query the system's running services for SolarWinds componentsAffected if The product is present on the system
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Determine the installed versionAccess the admin interface, check version information in the product's about or system settings, or inspect version files in the installation directoryAffected if The installed version is lower than 2025.4.1 (e.g., 2025.4.0, 2025.3.x, or earlier)
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Identify if user-created URL fields exist in the environmentNavigate to features where users can create or edit content containing URL parameters, such as dashboards, custom widgets, alerts, or notification configurationsAffected if Users have access to input or edit URL-based fields in any part of the application
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Check for suspicious URL entries with embedded scriptsReview stored URL configurations in the database or application configuration files, looking for URL values containing HTML tags, javascript: handlers, or event attributes like onload/onerrorAffected if URL fields contain unsanitized script injections that could execute when rendered
You are affected if SolarWinds Observability Self-Hosted is installed with a version lower than 2025.4.1 and users have access to create or edit URL fields in any feature.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped2025.4.1
Implement context-aware output encoding and validation for URL fields, enforce Content Security Policy headers, and apply vendor-supplied patches when available. Until patched, minimize exposure by restricting low-privilege user access to URL-related features.
2025.4.1 or later
- Review SolarWinds Observability Self-Hosted upgrade documentation at documentation.solarwinds.com
- Create a backup of your current installation and configuration
- Upgrade SolarWinds Observability Self-Hosted to version 2025.4.1 or later
- Verify the upgrade was successful and test that the XSS vulnerability is resolved in user-created URL fields
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-26391 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-26391 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data