# CVE-2026-28560: wpForo Forum 2.4.14 Stored XSS via Unsafe JSON Encoding in Inline Script

> Attackers can inject arbitrary scripts into all visitors' browsers via forum URL data in wpForo Forum due to unsafe JSON encoding.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 Feb 2026
- **Updated:** 11 May 2026
- **Also known as:** GHSA-qv3m-qhpr-9vhh

## What is CVE-2026-28560?

CVE-2026-28560 is a medium-severity cross-site scripting vulnerability in gVectors Team wpForo Forum, published on 28 Feb 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

wpForo Forum 2.4.14 contains a stored cross-site scripting vulnerability that allows script injection via forum URL data output into an inline script block using json_encode without the JSON_HEX_TAG flag. Attackers set a forum slug containing a closing script tag or unescaped single quote to break out of the JavaScript string context and execute arbitrary script in all visitors' browsers.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-28560?

It affects 1 product.


Products: Gvectors Wpforo Forum.

## How do I fix CVE-2026-28560?

No fix has been published for CVE-2026-28560 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-28560 being exploited?

There is no known exploitation of CVE-2026-28560 in the wild and no public exploit code.

## 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-2026-28560 and fix it if it is affected.

What it is: CVE-2026-28560 is a medium-severity cross-site scripting vulnerability in gVectors Team wpForo Forum, published on 28 Feb 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-28560 in the wild and no public exploit code.

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-2026-28560/ (Markdown: https://insights.sbomify.com/CVE-2026-28560/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-28560
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-28560
- OSV: https://osv.dev/vulnerability/CVE-2026-28560

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-28560/
Summaries are generated and may contain mistakes; the official description above is the record.