# 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.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Sep 2026
- **Updated:** 3 Sep 2026
- **Also known as:** GHSA-47hh-m5vw-329p

## 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 (Server-Side Request Forgery)

## 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.

## Is CVE-2026-85242 being exploited?

There is no known exploitation of CVE-2026-85242 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85242 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-85242 in the wild and no public exploit code.

Affected product: Lookyloo PlaywrightCapture. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-85242/ (Markdown: https://insights.sbomify.com/CVE-2026-85242/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85242
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85242
- OSV: https://osv.dev/vulnerability/CVE-2026-85242

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-85242/
Summaries are generated and may contain mistakes; the official description above is the record.