Lookyloo PlaywrightCapture up to 1.40.5 Favicon Retrieval server-side request forgery

Summaryinfo

A vulnerability categorized as critical has been discovered in Lookyloo PlaywrightCapture up to 1.40.5. This impacts an unknown function of the component Favicon Retrieval. Executing a manipulation can lead to server-side request forgery. The identification of this vulnerability is CVE-2026-73210. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in Lookyloo PlaywrightCapture up to 1.40.5. This vulnerability affects an unknown functionality of the component Favicon Retrieval. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A Server-Side Request Forgery (SSRF) vulnerability existed in Lookyloo's PlaywrightCapture when the only_global_lookup option was enabled. PlaywrightCapture implements this option to prevent captures from accessing local, loopback, or otherwise non-public network resources. However, favicon retrieval was performed separately from the browser request-routing protections. Favicon URLs extracted from rendered HTML were resolved and subsequently fetched directly using an aiohttp.ClientSession. An attacker able to supply or control a web page processed by PlaywrightCapture could include a crafted favicon reference, for example pointing to a loopback address, private IP address, or another resource reachable only from the PlaywrightCapture host. When the page was processed, the favicon retrieval routine could issue an HTTP request to this destination despite only_global_lookup being enabled. This bypass could therefore be used to make the PlaywrightCapture host interact with internal network services that should not be reachable through a capture. Depending on the targeted service and its response, this could enable internal service discovery, access to internal resources, or interaction with HTTP endpoints available only from the capture infrastructure. The patch introduces a common URL validation routine and applies it to favicon retrieval. Direct non-global IP addresses, localhost, .local domains, malformed URLs, and other explicitly non-public destinations are rejected before the favicon request is performed. This fix is a complementary fix to CVE-2026-44439 - GCVE-0-2026-44439 - GHSA-687H-XW6F-Q2QW

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-73210 since 08/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.40.6 eliminates this vulnerability. Applying the patch 5e6679717e97f7a18bb71d00a16b0876997fa10d is able to eliminate this problem.

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Productinfo

Vendor

• Lookyloo

Name

• PlaywrightCapture

Version

• 1.40.0
• 1.40.1
• 1.40.2
• 1.40.3
• 1.40.4
• 1.40.5

Website

• Product: https://github.com/Lookyloo/PlaywrightCapture/

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