What’s Vulnerable › Vulnerabilities

CVE-2021-29047

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-16 · updated 2026-07-09
• Weakness: CWE-287

Description

The SimpleCaptcha implementation in Liferay Portal 7.3.4, 7.3.5 and Liferay DXP 7.3 before fix pack 1 does not invalidate CAPTCHA answers after it is used, which allows remote attackers to repeatedly perform actions protected by a CAPTCHA challenge by reusing the same CAPTCHA answer.

Affected products

• Liferay DXP: before 7.3; 7.3 — fixed in 7.3
• Liferay Portal: 7.3.4, 7.3.5

How to fix

Upgrade to a fixed version: Liferay DXP 7.3. Check the vendor advisory for mitigations.

References

• https://portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5mxmVrnXW/content/id/120743467
• https://portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5mxmVrnXW/content/id/120743467

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