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Friday assorted links:

Ports that are blocked by browsers – Keenformatics – A (not so) tedious blog about informatics.

Turns out that some ports are explicitly blocked by browsers. This is done in response to the so-called Cross-protocol scripting vulnerability (VU#476267). Through this vulnerability, an attacker could forge malicious HTML code to send data to other services used by the victim (for example crafting spam emails, or printing through a network printer). IMAP, SMTP, NNTP and POP3 are just a small portion of the affected services.

🔗 https://www.keenformatics.com/ports-that-are-blocked-by-browsers