CVE-2021-34648: ninjaforms ninja_forms Missing Authorization
Vulnerability summary
CVE-2021-34648 is a medium (CVSS 6.4) Missing Authorization vulnerability in ninjaforms ninja_forms. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.4% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 22-09-2021PublishedVulnerability first disclosed.
- 31-03-2025Last modifiedVulnerability information updated.
Description
The Ninja Forms WordPress plugin is vulnerable to arbitrary email sending via the trigger_email_action function found in the ~/includes/Routes/Submissions.php file, in versions up to and including 3.5.7. This allows authenticated attackers to send arbitrary emails from the affected server via the /ninja-forms-submissions/email-action REST API which can be used to socially engineer victims.
CVSS metrics
4 scores · 3 sources · 2 versions- NVDNIST4.3MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NDiffers
- wordfenceSource6.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.66%
Chance of exploitation in the next 30 days
Percentile
50%
Versus all other CVEs
30-day change
0.00 pp
From 0.66% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (wordfence.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-863Incorrect AuthorizationThe product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Affected systems
Ninjaforms1 product
- ninja_forms≤ 3.5.7
Saturday drive1 product
- ninja forms3.5.7
Wordpress1 product
- ninja-forms≤ 3.5.7 (fixed in 3.5.8)
3 vendors · 3 products
References
3 links- plugins.trac.wordpress.org/browser/ninja-forms/trunk/includes/Routes/Submissions.php?rev=2543837X Refsource MISCPatchThird Party Advisory