What’s Vulnerable › Vulnerabilities

CVE-2023-45292: Captcha verification bypass in github.com/mojocn/base64Captcha

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-12-11 · updated 2026-06-17
• Weakness: CWE-345

Description

When using the default implementation of Verify to check a Captcha, verification can be bypassed. For example, if the first parameter is a non-existent id, the second parameter is an empty string, and the third parameter is true, the function will always consider the Captcha to be correct.

Affected products

• github.com/mojocn/base64Captcha: before 1.3.6 — fixed in 1.3.6

How to fix

Upgrade to a fixed version: github.com/mojocn/base64Captcha 1.3.6. Check the vendor advisory for mitigations.

References

• https://github.com/mojocn/base64Captcha/commit/5ab86bd6f333aad3936f912fc52b411168dcd4a7
• https://github.com/mojocn/base64Captcha/commit/9b11012caca58925f1e47c770f79f2fa47e3ad13
• https://github.com/mojocn/base64Captcha/issues/120
• https://pkg.go.dev/vuln/GO-2023-2386
• https://github.com/mojocn/base64Captcha/commit/5ab86bd6f333aad3936f912fc52b411168dcd4a7
• https://github.com/mojocn/base64Captcha/commit/9b11012caca58925f1e47c770f79f2fa47e3ad13
• https://github.com/mojocn/base64Captcha/issues/120
• https://pkg.go.dev/vuln/GO-2023-2386

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