Web Security ApplianceApplication · Cisco
CVE-2019-15969
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 · uneditedA vulnerability in the web-based management interface of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the interface of an affected device. The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script or HTML code in the context of the interface, which could allow the attacker to gain access to sensitive, browser-based information.
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 reflected XSS vulnerability in the web-based management interface of Cisco Web Security Appliance (WSA). An unauthenticated remote attacker can exploit insufficient input validation by tricking a user into clicking a crafted link, allowing arbitrary JavaScript or HTML execution in the user's browser context. This could enable session hijacking, credential theft, or other client-side attacks.
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
Web Security ApplianceApplication
< 11.8.0CVSS 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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Confirm Cisco WSA is presentIdentify Cisco Web Security Appliance in your network by checking for the device hostname, MAC vendor OUI (Cisco), or by reviewing network documentation and asset inventoriesAffected if Cisco WSA is found in the environment
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Determine WSA firmware versionLog into the WSA CLI and run the command 'version', or access the web management interface and navigate to System Administration > Status to view the installed versionAffected if The installed version is lower than 11.8.0 (for example, 11.7.x, 11.5.x, earlier releases)
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Verify web management interface is accessibleAttempt to reach the WSA web interface via HTTPS on port 443 from a test system, or review firewall rules and network access controls to determine if TCP 443 is open to untrusted networksAffected if The web management interface is reachable from networks other than trusted administration subnets
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Check for suspicious URL parameters in WSA logsReview WSA HTTP logs or proxy logs for requests to the management interface containing unusual script-related patterns such as <script>, javascript:, or event handlers like onload/onerrorAffected if Log analysis reveals crafted XSS payloads targeting the management interface URL parameters
You are affected if Cisco WSA is deployed with a firmware version below 11.8.0 and its web-based management interface is network-accessible to attackers who could deliver malicious links to administrators.
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.
From vendor data11.8.0
Apply the relevant Cisco security update for WSA as specified in the Cisco advisory. Until patched, users should be warned not to click untrusted links and consider restricting web management interface access to trusted networks only.
Fix this in Web Security Appliance
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-15969 — 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-2019-15969 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
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