# CVE-2021-24956: Blog2Social < 6.8.7 - Reflected Cross-Site Scripting

> Reflected Cross-Site Scripting in Blog2Social WordPress plugin allows attackers to inject malicious scripts into admin pages via the b2sShowByDate parameter.

- **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:** 21 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-8852-jmw6-m5gc

## What is CVE-2021-24956?

CVE-2021-24956 is a medium-severity cross-site scripting vulnerability in Unknown Blog2Social: Social Media Auto Post & Scheduler, published on 21 Dec 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 Blog2Social: Social Media Auto Post & Scheduler WordPress plugin before 6.8.7 does not sanitise and escape the b2sShowByDate parameter before outputting it back in an admin page, leading to a Reflected Cross-Site Scripting issue

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

## Which versions are affected by CVE-2021-24956?

It affects 1 product.


Products: Adenion Blog2social.

## How do I fix CVE-2021-24956?

No fix has been published for CVE-2021-24956 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24956 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24956 exists.

Public exploit code:

- Blog2Social < 6.8.7 - Cross-Site Scripting (nuclei): http/cves/2021/CVE-2021-24956.yaml

## Other vulnerabilities in Unknown Blog2Social: Social Media Auto Post & Scheduler

- [CVE-2024-3549](https://insights.sbomify.com/CVE-2024-3549/): Blog2Social: Social Media Auto Post & Scheduler <= 7.4.1 - Authenticated (Subscriber+) SQL Injection (critical 9.9)
- [CVE-2019-13572](https://insights.sbomify.com/CVE-2019-13572/): SQL injection in n/a (critical 9.8)
- [CVE-2022-3246](https://insights.sbomify.com/CVE-2022-3246/): Blog2Social < 6.9.10 - Subscriber+ SQLi (high 8.8)
- [CVE-2021-24137](https://insights.sbomify.com/CVE-2021-24137/): Blog2Social: Social Media Auto Post & Scheduler < 6.3.1 - Authenticated SQL Injection (high 8.8)
- [CVE-2023-40554](https://insights.sbomify.com/CVE-2023-40554/): WordPress Blog2Social Plugin <= 7.2.0 is vulnerable to Cross Site Scripting (XSS) (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24956 and fix it if it is affected.

What it is: CVE-2021-24956 is a medium-severity cross-site scripting vulnerability in Unknown Blog2Social: Social Media Auto Post & Scheduler, published on 21 Dec 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-2021-24956 exists.

Affected product: Unknown Blog2Social: Social Media Auto Post & Scheduler. 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-2021-24956/ (Markdown: https://insights.sbomify.com/CVE-2021-24956/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24956
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24956
- OSV: https://osv.dev/vulnerability/CVE-2021-24956

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-24956/
Summaries are generated and may contain mistakes; the official description above is the record.