# CVE-2021-36890: WordPress Social Share Buttons by Supsystic plugin <= 2.2.2 - Cross-Site Request Forgery (CSRF) vulnerability

> Attackers can trick authenticated users into performing unintended actions in the Social Share Buttons plugin, potentially altering settings.

- **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:** 31 May 2022
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-pmhc-3rxf-8xmf

## What is CVE-2021-36890?

CVE-2021-36890 is a medium-severity vulnerability in supsystic.com Social Share Buttons by Supsystic (WordPress plugin), published on 31 May 2022. 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

Cross-Site Request Forgery (CSRF) vulnerability in Social Share Buttons by Supsystic plugin <= 2.2.2 at WordPress.

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

## Which versions are affected by CVE-2021-36890?

It affects 1 product.


Products: Supsystic Social Share Buttons.

## How do I fix CVE-2021-36890?

No fix has been published for CVE-2021-36890 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-36890 being exploited?

There is no known exploitation of CVE-2021-36890 in the wild and no public exploit code.

## Other vulnerabilities in supsystic.com Social Share Buttons by Supsystic (WordPress plugin)

- [CVE-2022-33960](https://insights.sbomify.com/CVE-2022-33960/): SQL injection in Social Share Buttons by Supsystic (WordPress plugin) (high 8.5)
- [CVE-2022-27235](https://insights.sbomify.com/CVE-2022-27235/): WordPress Social Share Buttons by Supsystic plugin <= 2.2.3 - Multiple Broken Access Control vulnerabilities (medium 6.3)
- [CVE-2022-1653](https://insights.sbomify.com/CVE-2022-1653/): Social Share Buttons by Supsystic < 2.2.4 - Multiple CSRF (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36890 and fix it if it is affected.

What it is: CVE-2021-36890 is a medium-severity vulnerability in supsystic.com Social Share Buttons by Supsystic (WordPress plugin), published on 31 May 2022. 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-2021-36890 in the wild and no public exploit code.

Affected product: supsystic.com Social Share Buttons by Supsystic (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-2021-36890/ (Markdown: https://insights.sbomify.com/CVE-2021-36890/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36890
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36890
- OSV: https://osv.dev/vulnerability/CVE-2021-36890

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36890/
Summaries are generated and may contain mistakes; the official description above is the record.