Security Report Summary
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Site: https://slack.com/intl/en-ie/blog/collaboration
IP Address: 18.134.215.41
Report Time: 08 Oct 2026 16:38:19 UTC
Headers:
  • Strict-Transport-Security
  • Referrer-Policy
  • X-Frame-Options
  • Content-Security-Policy
  • X-Content-Type-Options
  • Permissions-Policy
Advanced:
Not bad… Maybe you should perform a deeper security analysis of your website and APIs:
Missing Headers
Content-Security-PolicyContent Security Policy is an effective measure to protect your site from XSS attacks. By whitelisting sources of approved content, you can prevent the browser from loading malicious assets.
X-Content-Type-OptionsX-Content-Type-Options stops a browser from trying to MIME-sniff the content type and forces it to stick with the declared content-type. The only valid value for this header is "X-Content-Type-Options: nosniff".
Permissions-PolicyPermissions Policy is a new header that allows a site to control which features and APIs can be used in the browser.
Raw Headers
HTTP/2200
dateThu, 08 Oct 2026 16:38:19 GMT
serverApache
varyAccept-Encoding
x-xss-protection0
content-typetext/html; charset=utf-8
strict-transport-securitymax-age=31536000; includeSubDomains; preload
referrer-policyno-referrer
x-slack-unique-idfaa05b82-8059-4cb0-8961-4ffb08f8b280
x-frame-optionsSAMEORIGIN
set-cookieb=0f2f48fa8aab60ceb2c2579fbc130375; expires=Wed, 08-Oct-2036 16:38:19 GMT; Max-Age=315619200; path=/; domain=.slack.com; secure; SameSite=None
set-cookiex=0f2f48fa8aab60ceb2c2579fbc130375.1791477499; expires=Thu, 08-Oct-2026 16:53:19 GMT; Max-Age=900; path=/; domain=.slack.com; secure; SameSite=None
set-cookieui=%7B%22v%22%3A1%2C%22sid%22%3A%220f2f48fa8aab60ceb2c2579fbc130375.1791477499%22%2C%22st%22%3A1791477499%2C%22pc%22%3A1%2C%22qs%22%3A%22%22%2C%22ref%22%3A%22https%3A%5C%2F%5C%2Fsecurityheaders.com%5C%2F%22%2C%22ii%22%3A13%2C%22ci%22%3A13%2C%22fs%22%3A0%2C%22tags%22%3A%5B13%5D%2C%22tc%22%3A%7B%2213%22%3A100%7D%2C%22vp%22%3A%5B%7B%22u%22%3A%22%5C%2Fblog%5C%2Fcollaboration%22%2C%22t%22%3A1791477499%2C%22g%22%3A%5B13%5D%7D%5D%2C%22sn%22%3A%5B%7B%22u%22%3A%22%5C%2Ffeatures%22%2C%22r%22%3Anull%2C%22p%22%3A1%2C%22v%22%3A0%7D%2C%7B%22u%22%3A%22%5C%2Fwhat-is-slack%22%2C%22r%22%3Anull%2C%22p%22%3A2%2C%22v%22%3A0%7D%2C%7B%22u%22%3A%22%5C%2Fcustomer-stories%22%2C%22r%22%3Anull%2C%22p%22%3A3%2C%22v%22%3A0%7D%5D%2C%22f1%22%3Anull%2C%22prev%22%3Anull%2C%22fsa%22%3A1791477499%2C%22ts%22%3A1%2C%22tpv%22%3A1%2C%22cp%22%3Anull%7D; expires=Fri, 08-Oct-2027 16:38:19 GMT; Max-Age=31536000; path=/; domain=.slack.com; secure; httponly; SameSite=Lax
via1.1 slack-prod.tinyspeck.com, ingress-www-iad-external-prod-0f861aba8c2fd90a4,ingress-edge-lhr-prod-0ffeeb00303c6f918
content-encodinggzip
content-length24752
x-envoy-upstream-service-time156
x-backendmain_normal
x-serverslack-www-hhvm-main-iad-0z5sohv7csx2
x-slack-shared-secret-outcomeno-match
x-edge-backendenvoy-www
timing-allow-origin*
alt-svch3=":443"; ma=2592000, h3-29=":443"; ma=2592000, quic=":443"; ma=2592000
x-slack-edge-shared-secret-outcomeno-match
Upcoming Headers
Cross-Origin-Embedder-PolicyCross-Origin Embedder Policy allows a site to prevent assets being loaded that do not grant permission to load them via CORS or CORP.
Cross-Origin-Opener-PolicyCross-Origin Opener Policy allows a site to opt-in to Cross-Origin Isolation in the browser.
Cross-Origin-Resource-PolicyCross-Origin Resource Policy allows a resource owner to specify who can load the resource.
Additional Information
serverThis Server header seems to advertise the software being run on the server but you can remove or change this value.
x-xss-protectionX-XSS-Protection sets the configuration for the XSS Auditor built into older browsers. The recommended value was "X-XSS-Protection: 1; mode=block" but you should now look at Content Security Policy instead.
strict-transport-securityHTTP Strict Transport Security is an excellent feature to support on your site and strengthens your implementation of TLS by getting the User Agent to enforce the use of HTTPS.
referrer-policyReferrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites.
x-frame-optionsX-Frame-Options tells the browser whether you want to allow your site to be framed or not. By preventing a browser from framing your site you can defend against attacks like clickjacking.