CVE-2025-59990
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 · uneditedAn Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Juniper Networks Junos Space allows an attacker to inject script tags in the template creation pages that, when visited by another user, enable the attacker to execute commands with the target's permissions, including an administrator. This issue affects all versions of Junos Space before 24.1R4.
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 · high confidenceThis is a stored Cross-site Scripting (XSS) vulnerability in Junos Space's template creation functionality. An authenticated attacker can inject malicious script tags into template fields that persist on the page. When other users (including administrators) view these templates, the injected scripts execute in their browser context, allowing the attacker to perform actions with the victim's privileges.
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< 24.1= 24.1CVSS 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
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/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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Check Junos Space versionAccess the Junos Space web UI and navigate to Administration > System > Software or use the CLI command 'show version' on the device. Locate the Junos Space version number.Affected if The installed version is lower than 24.1 or exactly equals 24.1 (for example, 24.1.0, 23.4, 23.3, etc.)
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Identify template creation feature accessLog into Junos Space and navigate to the template management section, typically found under Templates > Template Builder or a similar path depending on the UI version.Affected if The template creation or management interface is accessible and functional in your environment
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Review existing templates for suspicious contentIn the template management UI, examine all saved templates. Look for templates containing unusual characters, encoded strings, or script tags (<script>, <img onerror=, javascript:, etc.) in template names, descriptions, or configuration fields.Affected if Any template contains JavaScript tags, HTML tags with event handlers (onerror, onload, onclick), or other suspicious script-like content in its fields
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Check template audit logsIf available, review Junos Space audit logs or security logs for entries related to template creation or modification by users, focusing on unusual timestamps or unfamiliar user accounts.Affected if Audit logs show template modifications containing potentially malicious payload patterns
You are affected if your Junos Space version is 24.1 or below AND the template creation feature is accessible in your environment.
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 · scoped24.1
Upgrade Junos Space to version 24.1R4 or later. Until then, restrict access to the template creation functionality to trusted users only and monitor for suspicious activity.
24.1R4 or later
- Review the Junos Space upgrade guide in the Juniper support portal for detailed procedures
- Ensure you have a complete backup of the Junos Space configuration before upgrading
- Download Junos Space version 24.1R4 or later from the Juniper support portal
- Schedule a maintenance window as upgrades may cause service interruption
- Follow the standard Junos Space upgrade procedure: access the Administration > System > Software Update section in the web interface, or use the CLI upgrade command
- Verify the upgrade completed successfully and the version shows 24.1R4 or later
- Test the template creation functionality to confirm the XSS vulnerability is remediated
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-59990 — 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-2025-59990 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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- 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
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