{"id":"CVE-2021-24857","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-24857","generatedAt":"2026-10-28T02:59:03.692Z","title":"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.","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.","published":"2021-12-13T11:15:09.000Z","lastModified":"2026-06-17T03:41:01.000Z","status":"Modified","sourceIdentifier":"contact@wpscan.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-502"],"affected":["nocean/totop link"],"epss":{"score":0.01902,"percentile":0.79548,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.90%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://wpscan.com/vulnerability/518204d8-fbf5-4bfa-9db5-835f908f8d8e","tags":["Exploit","Third Party Advisory"],"source":"contact@wpscan.com"},{"url":"https://wpscan.com/vulnerability/518204d8-fbf5-4bfa-9db5-835f908f8d8e","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-24857","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}