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Twitter

twitter.com

UpGuard Security Report
Date scanned:

Security rating · scale 0–950 · grades A–F

Twitter's UpGuard security rating is C (590 / 950), which is fair. 10 of 66 external checks are currently failing, mostly in Website Security and DNS.

Strong

No failing checks in Email, IP/Domain Reputation, and Vulnerability Management.

Open risk

Failing checks: CSP is not implemented; HttpOnly cookies not used; X-Content-Type-Options is not nosniff; and 7 more.

Incidents

Most recent coverage: 5.4 Million Twitter Users' Stolen Data Leaked Online — More Shared Privately, published November 27, 2022.

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See the 66 checks behind this score

twitter.com

Security overview

UpGuard continuously monitors Twitter's externally observable security posture across Website Security, Email, Network, DNS, Encryption, Data leakage, IP/Domain Reputation, and Vulnerability Management. The rating reflects only what can be verified from outside the organization. It is not an audit of internal controls.

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Get alerted when Twitter's risk changes

UpGuard scans Twitter daily across 66 external risk signals. Get notified the moment something changes: a new vulnerability, a breach, or a posture shift.

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twitter.com security rating

Twitter data breaches, leaks & security incidents

Confirmed breaches, data leaks, cyber attacks, and hacking incidents involving Twitter, with sources and dates.
Module last updated November 4, 2026.

Detailed external checks

The evidence behind the rating. 66 checks across 8 categories, 10 currently failing. Failed checks are listed first.

Website Security

  • CSP is not implemented

    No valid Content Security Policy is implemented. This increases the risk of XSS and clickjacking attacks.

  • HttpOnly cookies not used

    When HttpOnly cookies are not used, the cookies can be accessed on the client, which enables certain type of client-side attacks. The website configuration should be changed to enforce HttpOnly cookies.

  • X-Content-Type-Options is not nosniff

    Browsers may interpret files as a different MIME type than what is specified in the Content-Type HTTP header. This can lead to MIME confusion attacks.

  • Unmaintained page detected

    This domain appears to be unmaintained based on indicators like page content or status code. Unmaintained pages expand the attack surface for malicious actors.

  • Secure cookies used

    Using secure cookies reduces the risk of third parties intercepting information contained in these cookies.

  • Server information header not exposed

    Ensuring the server information header is not exposed reduces the ability of attackers to exploit certain vulnerabilities.

  • X-Powered-By header not exposed

    Information about specific technology used on the server is obscured.

  • X-Frame-Options is not deny or sameorigin

    Browsers are prevented from displaying this website's content in frames. This helps mitigate clickjacking attacks.

  • Referrer policy is not unsafe-url

    The website's Referrer Policy is not configured to allow unsafe information to be sent in the referrer header.

  • ASP.NET version header not exposing specific ASP.net version

    Ensuring the ASP.NET version header is not exposing a specific version makes it harder for attackers to exploit certain vulnerabilities.

  • ASP.NET version header not exposed

    Ensuring the ASP.NET version header is not exposed makes it harder for attackers to exploit certain vulnerabilities.

Email

  • DMARC policy is not p=none

    DMARC reject policy provides the most effective protection against fraudulent emails being sent from a domain.

  • DMARC policy exists

    DMARC protects against fraudulent emails being sent from a domain.

  • Strict SPF filtering - not using +all

    Sender Policy Framework (SPF) record strictly enforces specific domains allowed to send email on its behalf.

  • SPF syntax correct

    Sender Policy Framework (SPF) record passes basic syntax checks.

  • DMARC policy percentage is default

    DMARC policy percentage is set to default 100%, ensuring all mail is covered by the policy.

  • SPF ptr mechanism not used

    Sender Policy Framework (SPF) record does not include the ptr mechanism.

Network

  • 'HTTP' port open

    The 'HTTP' service is running and exposed to the internet. The configuration of the server should be reviewed and unnecessary ports closed.

DNS

  • DNSSEC not enabled

    DNSSEC records prevent third parties from forging the records that guarantee a domain's identity. DNSSEC should be configured for this domain.

  • CAA not enabled

    The domain does not contain a valid Certification Authority Authorization (CAA) record. A CAA record indicates which Certificate Authorities (CAs) are authorized to issue certificates for a domain.

  • No unregistered MX records detected

    No unregistered MX records that could lead to receiving mail on behalf of the target organization were detected.

  • Domain has not expired

    Domain has not expired.

  • No subdomain takeover vulnerability detected

    No dangling DNS records that could lead to subdomain takeover were detected.

  • Domain does not expire soon

    Domain does not expire within 30 days.

  • Domain not flagged as inactive

    Domain is not flagged as inactive.

  • Domain not pending deletion

    Domain is not pending deletion with the registrar.

  • Domain not pending restoration

    Domain is not pending restoration with the registrar.

  • Domain registrar or registry deletion protection enabled

    Domain is protected from unsolicited deletion requests with the registrar or registry.

  • Domain registrar or registry transfer protection enabled

    Domain is protected from unsolicited transfer requests.

  • Domain registrar or registry update protection enabled

    Domain is protected from unsolicited update requests with the registrar or registry.

  • Domain free of registrar DNS resolution hold

    Domain is not under a DNS resolution hold with the registrar.

  • Domain free of registry DNS resolution hold

    Domain is not under a DNS resolution hold with the registry itself.

  • Domain renewal not prohibited by registry

    Domain is not prohibited from renewal at the registry itself.

Encryption

  • SSL not available

    SSL is the standard encryption method for browsing websites. Enabling SSL requires installing an SSL certificate on the site.

  • HTTP does not redirect to HTTPS

    The domain is still accessible over HTTP. All HTTP requests should be redirected to HTTPS.

  • Certificate not found on our revoked certificate list

    The site's certificate chain was checked against our list of revoked certificates.

  • Hostname matches SSL certificate

    The site's hostname matches the SSL certificate.

  • SSL has not expired

    SSL certificate has not expired.

  • Trusted SSL certificate

    The certificate presented by this domain was issued by a trusted certificate authority.

  • HTTP Strict Transport Security (HSTS) enforced

    With HSTS enforced, people browsing this site are less susceptible to man-in-the-middle attacks.

  • No insecure SSL/TLS versions available

    No insecure SSL/TLS versions are available for this site.

  • SSL certificate chain present in server response

    A complete SSL certificate chain was presented by the server for this domain.

  • SSL chain certificates do not expire within 20 days

    SSL intermediate and root certificates do not expire within 20 days.

  • SSL expiration period shorter than 398 days

    The SSL certificate presented by the server has an expiration period shorter than 398 days.

  • SSL has more than 20% of its valid period remaining

    SSL certificate does not expire in less than 20% of its total valid period.

  • Strong SSL algorithm

    Industry standard SHA-256 encryption in use.

  • Domain is included on the HSTS preload list

    Being included on the preload list gives the highest level of protection against MITM attacks for users of all major browsers.

  • Strong public certificate key length

    The site's public certificate provides at least 112 bits of security strength.

  • No weak cipher suites supported in TLS 1.2

    TLS connections to the site do not support any weak cipher suites.

Data leakage

  • Infostealer malware detected

    Infostealer malware has been detected on systems associated with this organization, indicating a potential data breach.

  • No open cloud storage service detected

    No cloud storage service configured to allow anonymous file listing was detected.

  • Domain index is not a listable directory

    The domain index is not a listable directory.

IP/Domain Reputation

  • No reports of botnet activity in the last 30 days

    This IP/domain has not been reported as a source of botnet activity in the last 30 days.

  • No reports of brute force login attempts in the last 30 days

    This IP/domain did not appear on any list of IPs and domains known to perform brute force login attempts in the last 30 days.

  • No reports of malware distribution in the last 30 days

    This IP/domain has been reported for distributing malware in the last 30 days.

  • No reports of unsolicited scanning in the last 30 days

    This IP/domain has not been reported for performing unsolicited scanning in the last 30 days.

  • No reports of phishing activity in the last 30 days

    This IP/domain has not been reported as a phishing site in the last 30 days.

  • No reports of botnet activity in the last 90 days

    This IP/domain has not been reported as a source of botnet activity in the last 90 days.

  • No reports of brute force login attempts in the last 90 days

    This IP/domain did not appear on any list of IPs and domains known to perform brute force login attempts in the last 90 days.

  • No reports of malware distribution in the last 90 days

    This IP/domain has been reported for distributing malware in the last 90 days.

  • No reports of unsolicited scanning in the last 90 days

    This IP/domain has not been reported for performing unsolicited scanning in the last 90 days.

  • No reports of phishing activity in the last 90 days

    This IP/domain has not been reported as a phishing site in the last 90 days.

Vulnerability Management

  • Not vulnerable to CVE-2014-0160 (Heartbleed)

    A bug in OpenSSL's implementation of the TLS heartbeat extension allows access to portions of memory on the targeted host e.g. cryptographic keys and passwords.

  • Not vulnerable to CVE-2014-3566 (POODLE)

    The server does not support SSLv3, and is not vulnerable to the POODLE attack.

  • Not vulnerable to CVE-2015-0204 (FREAK)

    The server does not offer RSA_EXPORT cipher suites, so clients are not vulnerable to the FREAK attack.

  • Not vulnerable to CVE-2015-4000 (Logjam)

    The server is using strong Diffie-Hellman parameters and is not vulnerable to the Logjam attack.

Company info

Company
Twitter
Domain
twitter.com
Employees
8k+
Location
San Francisco, CA, United States
CEO
Linda Yaccarino
Industry
IT and Telecommunications
Last updated
November 4, 2026

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