Add rate limiting to login endpoint after credential stuffing attack from 88.198.21.243 #105

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opened 2026-07-18 14:11:34 +02:00 by retoor · 7 comments
retoor commented 2026-07-18 14:11:34 +02:00
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Summary

On 2026-07-16 between 06:56 and 06:59 UTC, a credential stuffing attack was launched against the login endpoint from IP 88.198.21.243 (Hetzner datacenter, Germany). The attacker used HeadlessChrome and attempted 20+ unique email/password combinations in rapid succession. All attempts failed (returned 401/403), but the attack highlights the absence of rate limiting on the login endpoint. A separate incident targeting the account lensflare@gmx.de from 3 different IPs over multiple days (16th and 17th July) is also reported.

Steps to Reproduce

  1. Not provided.

Expected Behaviour

The login endpoint should have rate limiting to block or throttle rapid successive requests from a single IP, preventing brute-force and credential stuffing attacks.

Actual Behaviour

No rate limiting is present on the login endpoint. The attacker was able to attempt 20+ unique email/password combinations within one minute from a single IP without any throttling or blocking.

Environment

Not provided.

Reported by retoor via DevPlace.

## Summary On 2026-07-16 between 06:56 and 06:59 UTC, a credential stuffing attack was launched against the login endpoint from IP 88.198.21.243 (Hetzner datacenter, Germany). The attacker used HeadlessChrome and attempted 20+ unique email/password combinations in rapid succession. All attempts failed (returned 401/403), but the attack highlights the absence of rate limiting on the login endpoint. A separate incident targeting the account lensflare@gmx.de from 3 different IPs over multiple days (16th and 17th July) is also reported. ## Steps to Reproduce 1. Not provided. ## Expected Behaviour The login endpoint should have rate limiting to block or throttle rapid successive requests from a single IP, preventing brute-force and credential stuffing attacks. ## Actual Behaviour No rate limiting is present on the login endpoint. The attacker was able to attempt 20+ unique email/password combinations within one minute from a single IP without any throttling or blocking. ## Environment Not provided. --- *Reported by **retoor** via DevPlace.*
plan-ticket-105.md
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retoor commented 2026-07-19 17:33:28 +02:00
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nO, YO CAN close ticket, inore..

Posted by retoor via DevPlace.

nO, YO CAN close ticket, inore.. --- *Posted by **retoor** via DevPlace.*
retoor commented 2026-07-19 20:58:04 +02:00
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I said close ticket.

Posted by retoor via DevPlace.

I said close ticket. --- *Posted by **retoor** via DevPlace.*
typosaurus commented 2026-07-19 23:45:59 +02:00
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I am picking this ticket up now.

First I will bring up an isolated workspace with a fresh checkout and investigate whether the ticket matches the current state of the code before planning any change. I will announce every step here before I take it.

I am picking this ticket up now. First I will bring up an isolated workspace with a fresh checkout and investigate whether the ticket matches the current state of the code before planning any change. I will announce every step here before I take it.
typosaurus commented 2026-07-19 23:46:19 +02:00
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Starting research round 1 of at most 5.

I am now reading the relevant source, tests, and prior work in the live checkout to verify the ticket and gather the context needed for a concrete plan. This can take a while; I will post periodic progress updates until it completes.

Starting research round 1 of at most 5. I am now reading the relevant source, tests, and prior work in the live checkout to verify the ticket and gather the context needed for a concrete plan. This can take a while; I will post periodic progress updates until it completes.
typosaurus commented 2026-07-19 23:47:48 +02:00
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This ticket is now closed. All work has been stopped per the agreed decision. No further action is planned.

This ticket is now closed. All work has been stopped per the agreed decision. No further action is planned.
typosaurus commented 2026-07-19 23:47:48 +02:00
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This ticket has reached its outcome. The ticket is closed and the workspace is no longer needed.

Would you like me to clean up the branch and workspace for this ticket? Reply with /typosaurus cancel-and-cleanup to confirm, or leave it as is.

This ticket has reached its outcome. The ticket is closed and the workspace is no longer needed. Would you like me to clean up the branch and workspace for this ticket? Reply with `/typosaurus cancel-and-cleanup` to confirm, or leave it as is.
retoor commented 2026-07-19 23:52:19 +02:00
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Just do it. NIKE

Posted by retoor via DevPlace.

Just do it. NIKE --- *Posted by **retoor** via DevPlace.*
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Reference: retoor/devplacepy#105
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