# CVE-2021-36884: WordPress Backup Migration plugin <= 1.1.5 - Authenticated Persistent Cross-Site Scripting (XSS) vulnerability

> Authenticated attackers can inject persistent scripts into the Backup Migration plugin, potentially leading to session hijacking or malicious actions.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A: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:** 19 Nov 2021
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-5q55-ghjj-wjrp

## What is CVE-2021-36884?

CVE-2021-36884 is a medium-severity cross-site scripting vulnerability in Backupbliss Backup Migration (WordPress plugin), published on 19 Nov 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Authenticated Persistent Cross-Site Scripting (XSS) vulnerability discovered in WordPress Backup Migration plugin <= 1.1.5 versions.

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

## Which versions are affected by CVE-2021-36884?

It affects 1 product.


Products: Backupbliss Backup Migration.

## How do I fix CVE-2021-36884?

No fix has been published for CVE-2021-36884 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-36884 being exploited?

There is no known exploitation of CVE-2021-36884 in the wild and no public exploit code.

## Other vulnerabilities in Backupbliss Backup Migration (WordPress plugin)

- [CVE-2023-6972](https://insights.sbomify.com/CVE-2023-6972/): Backup Migration <= 1.3.9 - Unauthenticated Path Traversal to Arbitrary File Deletion (critical 9.8)
- [CVE-2023-6553](https://insights.sbomify.com/CVE-2023-6553/): Backup Migration <= 1.3.7 - Unauthenticated Remote Code Execution (critical 9.8)
- [CVE-2023-6971](https://insights.sbomify.com/CVE-2023-6971/): Code injection in Backup Migration (high 8.1)
- [CVE-2023-6266](https://insights.sbomify.com/CVE-2023-6266/): Backup Migration <= 1.3.6 - Unauthenticated Arbitrary Backup Download to Sensitive Information Exposure (high 7.5)
- [CVE-2023-6271](https://insights.sbomify.com/CVE-2023-6271/): Backup Migration Staging < 1.3.6 - Sensitive Data Exposure (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36884 and fix it if it is affected.

What it is: CVE-2021-36884 is a medium-severity cross-site scripting vulnerability in Backupbliss Backup Migration (WordPress plugin), published on 19 Nov 2021. 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-2021-36884 in the wild and no public exploit code.

Affected product: Backupbliss Backup Migration (WordPress plugin). 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-2021-36884/ (Markdown: https://insights.sbomify.com/CVE-2021-36884/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36884
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36884
- OSV: https://osv.dev/vulnerability/CVE-2021-36884

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36884/
Summaries are generated and may contain mistakes; the official description above is the record.