CVE-2021-4387: wordpress opal-estate Cross-Site Request Forgery (CSRF)
Vulnerability summary
CVE-2021-4387 is a high (CVSS 8.8) Cross-Site Request Forgery (CSRF) vulnerability in wordpress opal-estate. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.8% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 01-07-2023PublishedVulnerability first disclosed.
- 08-04-2026Last modifiedVulnerability information updated.
Description
The Opal Estate plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.6.11. This is due to missing or incorrect nonce validation on the opalestate_set_feature_property() and opalestate_remove_feature_property() functions. This makes it possible for unauthenticated attackers to set and remove featured properties via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
CVSS metrics
3 scores · 3 sources · 1 version- CVE.orgCNA4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NDiffers
- wordfenceSource4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NDiffers
EPSS trend
Probability
0.58%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
0.00 pp
From 0.58% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (blog.nintechnet.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Wordpress1 product
- opal-estate≤ 1.6.11
Wpopal1 product
- opal_estate≤ 1.6.11
2 vendors · 2 products
References
10 links- blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/Third Party Advisory
- blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/ExploitThird Party Advisory