Dobrý ráno!
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
bordalix
npub1vt…28cxv
2025-05-16 06:00:03
Author Public Key
npub1vt803quxxq32fuwkp42g2lyaw2t9qupvnl3z0vyc3s9kudkyhn8qt28cxvPublished at
2025-05-16 06:00:03Event JSON
{
"id": "60fcc8c28e6b4045db8fda5049b42a93e6ebaf2bc670230a907148f4165a4755",
"pubkey": "62cef883863022a4f1d60d54857c9d729650702c9fe227b0988c0b6e36c4bcce",
"created_at": 1747375203,
"kind": 1,
"tags": [],
"content": "Dobrý ráno!\n\nFriday assorted links:\n\nPorts that are blocked by browsers – Keenformatics – A (not so) tedious blog about informatics.\n\nTurns 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.\n\n🔗 https://www.keenformatics.com/ports-that-are-blocked-by-browsers",
"sig": "eb01e561c3b0cf4cb1cdc43da3f37b5fa175053a0f3ef0afc7f168e3381589812351fc2affe0324f469e225e176bc2f6a842ddbdd19fe67cea8239ba0d1b63e6"
}