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## Summary In the latest version of Koa, the back method used for redirect operations adopts an insecure implementation, which uses the user-controllable referrer header as the redirect target. ## Details on the API document https://www.koajs.net/api/response#responseredirecturl-alt, we can see: **response.redirect(url, [alt])** ``` Performs a [302] redirect to url. The string "back" is specially provided for Referrer support, using alt or "/" when Referrer does not exist. ctx.redirect('back'); ctx.redirect('back', '/index.html'); ctx.redirect('/login'); ctx.redirect('http://google.com'); ``` however, the "back" method is insecure: - https://github.com/koajs/koa/blob/master/lib/response.js#L322 ``` back (alt) { const url = this.ctx.get('Referrer') || alt || '/' this.redirect(url) }, ``` Referrer Header is User-Controlled. ## PoC **there is a demo for POC:** ``` const Koa = require('koa') const serve = require('koa-static') const Router = require('@koa/router') const...

### Impact Umbraco's [content delivery API](https://docs.umbraco.com/umbraco-cms/reference/content-delivery-api) can be restricted from public access such that an API key must be provided in a header to authorize the request. It's also possible to configure output caching, such that the delivery API outputs will be cached for a period of time, improving performance. There's an issue when these two things are used together though in that the caching doesn't vary by the header that contains the API key. As such it's possible for a user without a valid API key to retrieve a response for a given path and query if it has recently been requested and cached by request with a valid key. ### Patches Patches will be available in 13.9.3, 15.4.4 and 16.1.1. ### Workarounds Workaround is to remove or reduce the time period of the output caching or to provide other restrictions to access the delivery API such as by IP. ### References Content delivery API documentation: https://docs.umbraco.com...

After the initial uproar about leaked images, a researcher was able to access Tea Dating app private messages

Allianz notified authorities about a data breach that exposed the information about almost all its US customers

Choicejacking is a new USB attack that tricks phones into sharing data at public charging stations, bypassing security prompts in milliseconds.

This week on the Lock and Code podcast, we revisit an interview with Joseph Cox about the largest FBI sting operation ever carried out.

This week on the Lock and Code podcast, we revisit an interview with Joseph Cox about the largest FBI sting operation ever carried out.

Cybersecurity researchers have disclosed a now-patched critical security flaw in a popular vibe coding platform called Base44 that could allow unauthorized access to private applications built by its users. "The vulnerability we discovered was remarkably simple to exploit -- by providing only a non-secret app_id value to undocumented registration and email verification endpoints, an attacker

The Memos application, up to version v0.24.3, allows for the embedding of markdown images with arbitrary URLs. When a user views a memo containing such an image, their browser automatically fetches the image URL without explicit user consent or interaction beyond viewing the memo. This can be exploited by an attacker to disclose the viewing user's IP address, browser User-Agent string, and potentially other request-specific information to the attacker-controlled server, leading to information disclosure and user tracking.

Allianz Life Insurance confirms a July 2025 data breach impacting 1.4 million customers, financial pros and employees. Learn how social engineering exploited a third-party CRM, the hallmarks of Scattered Spider tactics, and the broader risks of supply chain vulnerabilities.