# CVE-2024-8477: Cross-site request forgery in Brevo – Email, SMS, Web Push, Chat, and more.

> Unauthenticated attackers can force site administrators to log out of Brevo connections via forged requests, requiring user interaction.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Oct 2024
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-qc4q-h4wc-9xq4

## What is CVE-2024-8477?

CVE-2024-8477 is a medium-severity vulnerability in neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more., published on 10 Oct 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue) plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.1.87. This is due to missing or incorrect nonce validation on the Init() function. This makes it possible for unauthenticated attackers to log out of a Brevo connection via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2024-8477?

It affects 1 product.


Products: Brevo Newsletter\, Smtp\, Email Marketing and Subscribe.

## How do I fix CVE-2024-8477?

No fix has been published for CVE-2024-8477 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-8477 being exploited?

There is no known exploitation of CVE-2024-8477 in the wild and no public exploit code.

## Other vulnerabilities in neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more.

- [CVE-2024-35668](https://insights.sbomify.com/CVE-2024-35668/): Cross-site scripting in Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue (high 7.1)
- [CVE-2023-2472](https://insights.sbomify.com/CVE-2023-2472/): Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue < 3.1.61 - Reflected XSS (medium 6.1)
- [CVE-2021-24874](https://insights.sbomify.com/CVE-2021-24874/): Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue < 3.1.31 - Reflected Cross-Site Scripting (medium 6.1)
- [CVE-2021-24923](https://insights.sbomify.com/CVE-2021-24923/): Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue < 3.1.25 - Reflected XSS (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-8477 and fix it if it is affected.

What it is: CVE-2024-8477 is a medium-severity vulnerability in neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more., published on 10 Oct 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-8477 in the wild and no public exploit code.

Affected product: neeraj_slit Brevo – Email, SMS, Web Push, Chat, and more.. 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-2024-8477/ (Markdown: https://insights.sbomify.com/CVE-2024-8477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-8477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-8477
- OSV: https://osv.dev/vulnerability/CVE-2024-8477

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-8477/
Summaries are generated and may contain mistakes; the official description above is the record.