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

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

Which versions are affected by CVE-2021-24956?

It affects 1 product.

Products include 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.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

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: 1 Nuclei template.

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

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

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8852-jmw6-m5gc.