# CVE-2024-47779: Element Web vulnerable to potential exposure of access token via authenticated media

> Attackers can expose access tokens via malicious widgets, potentially leading to account takeover in Element Web clients.

- **Severity:** High 7.0 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Oct 2024
- **Updated:** 12 Nov 2024
- **Also known as:** GHSA-3jm3-x98c-r34x

## What is CVE-2024-47779?

CVE-2024-47779 is a high-severity vulnerability in element-hq element-web, published on 15 Oct 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Element is a Matrix web client built using the Matrix React SDK. Element Web versions 1.11.70 through 1.11.80 contain a vulnerability which can, under specially crafted conditions, lead to the access token becoming exposed to third parties. At least one vector has been identified internally, involving malicious widgets, but other vectors may exist. Note that despite superficial similarity to CVE-2024-47771, this is an entirely separate vulnerability, caused by a separate piece of code included only in Element Web. Element Web and Element Desktop share most but not all, of their code and this vulnerability exists in the part of the code base which is not shared between the projects. Users are strongly advised to upgrade to version 1.11.81 to remediate the issue. As a workaround, avoid granting permissions to untrusted widgets.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2024-47779?


## How do I fix CVE-2024-47779?

No fix has been published for CVE-2024-47779 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-47779 being exploited?

There is no known exploitation of CVE-2024-47779 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-47779 and fix it if it is affected.

What it is: CVE-2024-47779 is a high-severity vulnerability in element-hq element-web, published on 15 Oct 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-47779 in the wild and no public exploit code.

Affected product: element-hq element-web. 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-2024-47779/ (Markdown: https://insights.sbomify.com/CVE-2024-47779/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-47779
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-47779
- OSV: https://osv.dev/vulnerability/CVE-2024-47779

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-47779/
Summaries are generated and may contain mistakes; the official description above is the record.