Cookie Session Security Checker
Fast, accurate and free online cookie session security checker tool running directly in your browser.
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Cookie and Session Security Tester
This tool retrieves Set-Cookie headers for the specified URL and assesses cookie security: Secure/HttpOnly flags, SameSite, lifetime, and basic session identifier characteristics. The result is informational and heuristic - use it to audit your own services or services where you have formal permission.
Analysis scope
The retrieved Set-Cookie headers revealed no cookies with clear security issues. Remember that this is a quick heuristic test and does not replace a full audit.
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Other tools you may find usefulCookie & Session Security Checker - check the security of cookies and HTTP sessions on your website
Cookie & Session Security Checker is a practical online tool that reads Set-Cookie headers from the server response, analyzes cookie and HTTP session security flags, and then shows in a simple report where the configuration is secure and where strengthening is needed before you start thinking about a larger-scale security audit.
What exactly does Cookie & Session Security Checker check on your website
When you enter a URL in Cookie & Session Security Checker, the tool sends a single HTTP request to your website, reads the server's response and focuses on Set-Cookie headers, which create or update cookies responsible for, among other things, user sessions, remembering logins, personalization and preference settings, so you can quickly get an idea of what the security layer looks like on the browser side.
The tool does not modify the server configuration or interfere with the application, it only reads publicly available HTTP headers, sorts them, classifies cookies as session or regular, and assesses the risk level based on whether the Secure and HttpOnly flags are enabled, how SameSite works, how the cookie lifetime is planned, and whether the domain and path are set in a way that does not open unnecessary doors to abuse.
- Reads all Set-Cookie headers that the server sends for the given URL.
- Detects which cookies appear to be session cookies, such as PHPSESSID, JSESSIONID, ASP.NET_SessionId, sessionid, sid, and similar names.
- Checks whether the Secure and HttpOnly flags are enabled, especially for session cookies on HTTPS connections.
- Analyzes the SameSite setting, which is important for protection against CSRF attacks and cross-site cookie sending abuse.
- Looks at the cookie's domain, path, expiration time and maximum age attributes to better understand its scope and persistence.
- Masks cookie values in the report so that full session IDs are not displayed in the browser, reducing the risk of accidental leakage.
How Cookie & Session Security Checker works step by step
The tool's interface has been prepared so that the security analysis of cookies and HTTP sessions can be used by both technical people and website owners who simply want to check whether the configuration looks healthy, so the entire operation can be summarized in a few intuitive steps, without searching for options in extensive panels.
1. Enter the URL and set the timeout
In the first step, you enter the address of the page you want to analyze, for examplehttps://yourdomain.plor a specific subpage of the login panel, and Cookie & Session Security Checker will normalize the address and check whether it looks correct, and additionally you can set a response timeout to avoid long waits at slower speeds servers.
2. You choose what is to be analyzed
The tool allows you to enable or disable individual analysis modules, so you can decide whether Cookie & Session Security Checker should take into account the Secure and HttpOnly flags, detect session cookies, assess cookie lifetime or look at the domain and path, and in a typical scenario it is worth simply leaving all the switches on and performing a full check.
3. You run the scan and wait for the report
After clicking the run button, Cookie & Session Security Checker performs a single HTTP request, saves the response status, the final address after any redirections, the resolved IP address and all Set-Cookie headers, and during operation it displays a simple progress bar that informs that the cookie and session analysis is in progress and does not require any additional action from you.
4. You receive a clear report with the risk level
After the scan is completed, the tool shows a summary of the server's response, the number of detected cookies, the number of session cookies and those marked as high risk, and below it presents detailed tables in which each cookie has a description of the type, risk level, the most important flags and understandable reasons why a given element was considered potentially problematic.
How Cookie & Session Security Checker assesses the security of cookies
The heart of the tool is logic that builds a small report for each cookie, combining information about whether the cookie appears to be session, what its Secure, HttpOnly and SameSite attributes are, how long it will be valid and for what domain and path it has been set, and then assigns a risk level: low, medium or high based on simple rules.
| Risk level | Cookie type | What it usually means in practice |
|---|---|---|
| low | The cookie has the Secure and HttpOnly flags enabled, and SameSite is set to Lax or Strict, which limits risky scenarios related to sending cookies between sites. | A typical, healthy configuration for most session cookies and many technical cookies, which usually does not require urgent intervention, although it is still useful to have it documented. |
| medium | The cookie has partially correct settings, but it is missing, for example, the Secure flag for HTTPS or does not use HttpOnly, even though it looks like a session element. | The configuration may be improved in the next application or server update, especially where a cookie is used for logging in or storing sensitive identifiers. |
| high | A session cookie without Secure on HTTPS, SameSite=None without Secure, or a very long-lived cookie with a wide domain and path that can be used in undesirable ways. | These types of items should be prioritized, consulted with your technical team, and planned for a configuration change before it becomes a security or compliance issue. |
What you will see in the Cookie & Session Security Checker report
To make the report useful for both technical and business people, Cookie & Session Security Checker divides the results into three main sections, so immediately after scanning you see a short summary, a list of the riskiest cookies and a full table of all cookies detected for a given URL.
Server Response Summary
At the top of the report you will find the input URL, the final address after redirection, the HTTP status code, the IP address being resolved, as well as the number of total cookies, the number of session cookies and the number of those classified as high risk, allowing you to assess the overall picture of session security on a given site in just a few seconds.
The riskiest cookies
Below, the tool shows a section with a list of cookies with the highest risk, where for each element you will find a name, information whether it looks sessional, risk level, masked value and bulleted reasons, thanks to which it is easy to explain to the development team what exactly should be changed in the configuration.
Full table of all cookies
The last part of the report is a full table of all cookies detected for a given address, along with name, type, risk level, masked value, Secure and HttpOnly flags, SameSite setting, expiration date or Max-Age information, and short comments that explain where the risk rating for a given cookie came from.
Preview of raw Set-Cookie headers
For technical users, there is also a preview of raw Set-Cookie headers, exactly as they were returned by the server, so you can compare them with the parsing results and more easily debug unusual cases or non-standard attributes that appear in the application configuration.
Who is Cookie & Session Security Checker for
Cookie & Session Security Checker will be useful wherever the security of sessions and cookies is important, but there is no time to manually click headers in developer tools on a daily basis, which is why the tool is eagerly used by both administrators, product owners and people responsible for compliance and data protection.
Administrators and website owners
A quick way to check whether session cookies are properly secured before you start setting up security policies with auditors or clients who ask for configuration details.
Development and DevOps teams
An ideal tool for verifying whether the Secure and HttpOnly flags have not disappeared or cookies with too broad a scope have not appeared after implementing a new version of the application or changing the reverse proxy configuration.
Security and compliance specialists
A clear report that can be attached to documentation, shown to a client or used during a security review, without manually writing all the cookies from browser tools.
Frequently asked questions about Cookie & Session Security Checker
Does the tool see full cookie values
Cookie & Session Security Checker reads full Set-Cookie headers, but masks cookie values in the report so that full session IDs and other sensitive data do not appear in the interface, so you can safely use the tool in the presence of people who should not see raw session cookie values.
Does cookie analysis affect the operation of the website
No, the tool sends a single HTTP request similar to a regular user visit, does not make any changes on the server side and does not send mass scans, so its impact on performance is practically unnoticeable and safe even for production environments.
How often is it worth running Cookie & Session Security Checker
It is a good habit to run the tool after each major change in the web application, HTTPS configuration, implementation of a new CDN or WAF, and in stable environments at least once every few weeks, thanks to which you will notice unusual cookies or neglected security flags before they become a real problem.
What to do if the report shows high-risk cookies
If Cookie & Session Security Checker shows cookies marked as high risk, treat it as a priority list to discuss with the technical team who can, for example, force HTTPS for the session, enable HttpOnly, refine SameSite or shorten the life of cookies, and if you do not have an IT department, it is worth passing the report to the person responsible for implementing the website or to the company that helps you maintain the site.
Check the security of cookies and HTTP sessions on your website
Enter the URL, select what elements you want to analyze and run Cookie & Session Security Checker to see in a few moments how your website treats session cookies, whether the Secure and HttpOnly flags are set correctly and whether SameSite, domain and cookie lifetime require urgent correction.