# CVE-2021-24406: wpForo Forum < 1.9.7 - Open Redirect

> An attacker can redirect users to malicious sites after login, potentially stealing credentials through phishing replicas.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:** 6 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-pvwf-fqcf-wm8q

## What is CVE-2021-24406?

CVE-2021-24406 is a medium-severity vulnerability in gVectors Team wpForo Forum, published on 6 Jul 2021. 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 wpForo Forum WordPress plugin before 1.9.7 did not validate the redirect_to parameter in the login form of the forum, leading to an open redirect issue after a successful login. Such issue could allow an attacker to induce a user to use a login URL redirecting to a website under their control and being a replica of the legitimate one, asking them to re-enter their credentials (which will then in the attacker hands)

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2021-24406?

It affects 1 product.


Products: Gvectors Wpforo Forum.

## How do I fix CVE-2021-24406?

No fix has been published for CVE-2021-24406 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24406 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24406 exists.

Public exploit code:

- WordPress wpForo Forum < 1.9.7 - Open Redirect (nuclei): http/cves/2021/CVE-2021-24406.yaml

## Other vulnerabilities in gVectors Team wpForo Forum

- [CVE-2024-3200](https://insights.sbomify.com/CVE-2024-3200/): wpForo Forum <= 2.3.3 - Authenticated (Contributor+) SQL Injection (critical 9.9)
- [CVE-2022-40200](https://insights.sbomify.com/CVE-2022-40200/): WordPress wpForo Forum plugin <= 2.0.9 - Auth. Arbitrary File Upload vulnerability (critical 9.9)
- [CVE-2018-16613](https://insights.sbomify.com/CVE-2018-16613/): Privilege escalation in n/a (critical 9.8)
- [CVE-2026-28562](https://insights.sbomify.com/CVE-2026-28562/): wpForo Forum 2.4.14 SQL Injection via Topics ORDER BY Parameter (high 8.8)
- [CVE-2023-2249](https://insights.sbomify.com/CVE-2023-2249/): Server-side request forgery in wpForo Forum (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24406 and fix it if it is affected.

What it is: CVE-2021-24406 is a medium-severity vulnerability in gVectors Team wpForo Forum, published on 6 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24406 exists.

Affected product: gVectors Team wpForo Forum. 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-2021-24406/ (Markdown: https://insights.sbomify.com/CVE-2021-24406/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24406
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24406
- OSV: https://osv.dev/vulnerability/CVE-2021-24406

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24406/
Summaries are generated and may contain mistakes; the official description above is the record.