What’s Vulnerable › Vulnerabilities

CVE-2021-24633: Countdown Block < 1.1.2 - Missing Authorisation in AJAX action

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-27 · updated 2026-06-17
• Weakness: CWE-862

Description

The Countdown Block WordPress plugin before 1.1.2 does not have authorisation in the eb_write_block_css AJAX action, which allows any authenticated user, such as Subscriber, to modify post contents displayed to users.

Affected products

• Countdown Block: before 1.1.2 — fixed in 1.1.2

How to fix

Upgrade to a fixed version: Countdown Block 1.1.2. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/431901eb-0f95-4033-b943-324e6d3844a5
• https://wpscan.com/vulnerability/431901eb-0f95-4033-b943-324e6d3844a5

Get alerted when CVE-2021-24633 or the next vulnerability affects your stack