What’s Vulnerable › Vulnerabilities

CVE-2021-24857: ToTop Link <= 1.7.1 - Unauthenticated PHP Object Injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-13 · updated 2026-06-17
• Weakness: CWE-502

Description

The ToTop Link WordPress plugin through 1.7.1 passes base64 encoded user input to the unserialize() PHP function, which could lead to PHP Object injection if a plugin installed on the blog has a suitable gadget chain.

Affected products

• ToTop Link: through 1.7.1

References

• https://wpscan.com/vulnerability/518204d8-fbf5-4bfa-9db5-835f908f8d8e
• https://wpscan.com/vulnerability/518204d8-fbf5-4bfa-9db5-835f908f8d8e

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