CVE-2026-85242 Server-Side Request Forgery via Favicon Redirect to Local Network Resources in PlaywrightCapture
Attackers can bypass local address restrictions via favicon redirects to access internal network resources in PlaywrightCapture when global lookup is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85242?
CVE-2026-85242 is a medium-severity server-side request forgery vulnerability in Lookyloo PlaywrightCapture, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PlaywrightCapture contains a server-side request forgery (SSRF) vulnerability in its favicon retrieval functionality. When only_global_lookup is enabled, the application validates the initial favicon URL to prevent requests to localhost, loopback, or other non-public network addresses. However, redirects followed by aiohttp were not subjected to the same validation.
An attacker able to influence the content of a page processed by PlaywrightCapture could specify a publicly reachable favicon URL that responds with an HTTP redirect to a local or otherwise restricted address, such as 127.0.0.1, localhost, or an internal network service. Because aiohttp automatically followed the redirect, the resulting request could bypass the application's local-address restrictions and cause the PlaywrightCapture host to issue HTTP requests to resources that should not be externally reachable.
Depending on the services reachable from the PlaywrightCapture host and how retrieved favicon data is subsequently exposed or processed, this could be used to probe internal HTTP services or potentially obtain information from otherwise inaccessible endpoints.
The patch introduces an aiohttp request middleware that applies the existing local-URL validation to every request in the redirect chain. Requests resolving to restricted/local destinations are rejected before they are issued.
Weakness: CWE-918
Which versions are affected by CVE-2026-85242?
How do I fix CVE-2026-85242?
No fix has been published for CVE-2026-85242 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-85242 being exploited?
There is no known exploitation of CVE-2026-85242 in the wild and no public exploit code.
Sources
Also known as GHSA-47hh-m5vw-329p.