CVE-2021-24163: ninjaforms ninja_forms Missing Authorization
Vulnerability summary
CVE-2021-24163 is a high (CVSS 8.8) Missing Authorization vulnerability in ninjaforms ninja_forms. EPSS estimates a 1.44% chance of exploitation in the next 30 days, higher than 72.8% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 05-04-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
The AJAX action, wp_ajax_ninja_forms_sendwp_remote_install_handler, did not have a capability check on it, nor did it have any nonce protection, therefore making it possible for low-level users, such as subscribers, to install and activate the SendWP Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress WordPress plugin before 3.4.34 and retrieve the client_secret key needed to establish the SendWP connection while also installing the SendWP plugin.
CVSS metrics
3 scores · 2 sources · 2 versions- wordfenceSource8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.44%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
0.00 pp
From 1.44% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (wpscan.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-862Missing AuthorizationThe product does not perform an authorization check when an actor attempts to access a resource or perform an action.
- CWE-200Exposure of Sensitive Information to an Unauthorized ActorThe product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
Affected systems
Ninjaforms1 product
- ninja_forms< 3.4.34
Unknown1 product
- ninja forms contact form – the drag and drop form builder for wordpress≥ 3.4.34, < 3.4.34
Wordpress1 product
- ninja-forms< 3.4.34
3 vendors · 3 products
References
3 links- wpscan.com/vulnerability/55fde9fa-f6cd-4546-bee8-4acc628251c2X Refsource CONFIRMExploitThird Party Advisory