Is www.seznam.cz Safe? Security Score 90.6/100 | CyStack
www.seznam.cz
Seznam – najdu tam, co neznám
Nejnavštěvovanější český internetový portál nabízející vyhledávač, e-mail, aktuální zprávy, předpověď počasí a odkazy, které se mohou hodit.
Industry
Computers, Electronics and Technology / Search Engines
Origin
Czechia
Global rank
#233
Rank in Czechia
#3
Updated at
A90.6/100
Security level
Excellent
Data confidence
High
Scope checked
100%
The higher the score, the more externally observable protections the system has recorded. This page does not certify that the website is reputable, legitimate, or completely free of vulnerabilities.
Is the website “www.seznam.cz” safe?
As of August 22, 2026 at 09:03, www.seznam.cz has a security score of 90.6/100 (grade A – “Excellent”). CyStack’s automated assessment recorded 8 issues to review after completing 100% of applicable checks. The website owner should address “Allowed browser content (CSP)” first, then review the remaining items in order of impact.
Does www.seznam.cz show known scam, phishing, or malware signals?
At assessment time, CyStack did not find www.seznam.cz or related infrastructure on any scam, phishing, or malware warning list after checking 5 online reputation sources. This result reflects external observations; it does not guarantee absolute safety or verify the organization’s legal status or reputation.
Potentially exposed domain email addressesChecks infostealer data for email addresses ending in @seznam.cz, the registered domain of the assessed website www.seznam.cz. A record is not counted merely because someone visited or signed in to the website.10,000+ Matching email exposure records
10,000+Matching email exposure records
17,185Related infected devices (estimated)
These matching email records were observed previously, but they may already have been addressed or may no longer be valid. The device count estimates infected devices associated with these email records; it is not the number of devices owned by the organization.
The counting limit was reached, so the actual number may be higher.
Frequently asked questions
What affects the security of www.seznam.cz?
A valid SSL certificate still does not prove that www.seznam.cz is safe, legitimate, or free of scam signals. For a more complete assessment, this report also checks phishing and malware, exposed email records, IPs and open ports, subdomains, technologies, and CVEs that may apply to observed versions.
Does www.seznam.cz use HTTPS, and is its SSL certificate valid?
www.seznam.cz used a valid SSL certificate at assessment time, valid until October 30, 2026. This status may change when the certificate expires or the server configuration changes.
Have @seznam.cz email addresses appeared in exposed data or information-stealer (infostealer) logs?
Data sources
Data compiled from CyStack cybersecurity monitoring systems
CyStack compiles scan results from its internal cybersecurity monitoring systems, including CyStack VulnScan and CyStack Threat Intelligence, together with publicly available Internet data. The assessment only observes and analyzes information already available; it does not attempt unauthorized access, test passwords, send exploit code, or change or disrupt the assessed system.
These 3 failed checks or warnings have the greatest impact on the result for www.seznam.cz.
Allowed browser content (CSP)The CSP on the inspected root HTML response contains a broad, unsafe, or missing script-source control recognized by this bounded check.High
Why it matters
Content Security Policy (CSP) limits where scripts, styles, frames, and other browser content may come from. A strong policy reduces the impact if an attacker manages to inject content into a page.
What to do
Define only the sources the application needs, test the policy before activating it, and avoid broad wildcard (*) rules, unsafe-inline, and unsafe-eval where possible.
Scope of this check
This check only evaluates the homepage response and content that the scanner could reach. Other pages and sign-in flows may use different settings.
DMARC blocking policyThe effective DMARC policy is none and applies to 100% of messages.High
Why it matters
A policy of quarantine or reject tells receiving services to move suspicious mail to spam or refuse it. A monitoring-only policy (p=none) records the problem but does not ask receivers to stop spoofed mail.
What to do
After every legitimate sender passes DMARC, move gradually to quarantine and then reject, covering 100% of messages.
Evidence and check scope
Correct file-type handling (nosniff)The inspected root response does not set X-Content-Type-Options to nosniff.Medium
Why it matters
Without the nosniff setting, a browser may guess a file's type and treat harmless-looking content as executable code. This can turn an incorrect Content-Type into a security issue.
What to do
Send X-Content-Type-Options: nosniff on every response and return an accurate Content-Type.
Scope of this check
Leak evidenceMost recent observation:
Email addressRelated infected deviceInfection evidenceRecorded time
Discovered subdomains (1,450+)Subdomains of seznam.cz, the registered domain of the assessed website www.seznam.cz. Sensitive-looking names are shown first; individual subdomains have not been separately security-tested.Partial
Results were bounded and may be truncated.
admin.pocasi.seznam.czSensitive-lookingAdmin system
Public web contextThe website title, description, industry and popularity.
Page title
Seznam – najdu tam, co neznám
Website category
Computers, Electronics and Technology / Search Engines
Description
Nejnavštěvovanější český internetový portál nabízející vyhledávač, e-mail, aktuální zprávy, předpověď počasí a odkazy, které se mohou hodit.
Global rank
#233
Rank in Czechia
#3
Rank in industry
#2
Final URL
https://www.seznam.cz/
Website rankings and industry category are based on data from Similarweb
This is a quick, point-in-time check from outside the organization. It can surface visible risks, but it does not replace penetration testing or an authenticated assessment.
There are currently 10,000+ exposed email records matching the seznam.cz domain. These records may be old or already resolved. The website owner should verify them before resetting passwords or locking related accounts.
Which public IPs, services, and ports does www.seznam.cz expose?
The assessment observed 4 public IPs and 4 open ports for www.seznam.cz. An open port is not the same as a vulnerability, but the website owner should keep every public service updated and appropriately restrict access.
How many subdomains of seznam.cz have been discovered?
The assessment observed 1,450+ public subdomains of seznam.cz. This list can reveal additional entry points such as APIs, administration systems, or test environments, but it does not mean that every subdomain is risky.
Industry
Updated at 
Czechia
