# CVE-2026-2433: Cross-site scripting in RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging

> Unauthenticated attackers can execute arbitrary JavaScript in an administrator's session via crafted postMessage payloads, potentially leading to account takeover.

- **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:** 7 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-4j4f-wwp5-72mp

## What is CVE-2026-2433?

CVE-2026-2433 is a medium-severity cross-site scripting vulnerability in rebelcode RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging, published on 7 Mar 2026. 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 RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via postMessage in all versions up to, and including, 5.0.11. This is due to the plugin's admin-shell.js registering a global message event listener without origin validation (missing event.origin check) and directly passing user-controlled URLs to window.open() without URL scheme validation. This makes it possible for unauthenticated attackers to execute arbitrary JavaScript in the context of an authenticated administrator's session by tricking them into visiting a malicious website that sends crafted postMessage payloads to the plugin's admin page.

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

## Which versions are affected by CVE-2026-2433?


## How do I fix CVE-2026-2433?

No fix has been published for CVE-2026-2433 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2433 being exploited?

There is no known exploitation of CVE-2026-2433 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2433 and fix it if it is affected.

What it is: CVE-2026-2433 is a medium-severity cross-site scripting vulnerability in rebelcode RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging, published on 7 Mar 2026. 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-2026-2433 in the wild and no public exploit code.

Affected product: rebelcode RSS Aggregator – RSS Import, News Feeds, Feed to Post, and Autoblogging. 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-2026-2433/ (Markdown: https://insights.sbomify.com/CVE-2026-2433/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2433
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2433
- OSV: https://osv.dev/vulnerability/CVE-2026-2433

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-2433/
Summaries are generated and may contain mistakes; the official description above is the record.