{"id":"CVE-2021-24857","aliases":["EUVD-2021-11769","GHSA-q5c4-rqq9-f524"],"status":"published","title":"ToTop Link \u003c= 1.7.1 - Unauthenticated PHP Object Injection","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01902,"percentile":0.79966,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-502"],"published":"2021-12-13T10:41:09Z","modified":"2026-06-17T03:41:01Z","products":[{"vendor":"nocean","product":"totop_link"},{"vendor":"unknown","product":"totop link"}],"references":[{"url":"https://wpscan.com/vulnerability/518204d8-fbf5-4bfa-9db5-835f908f8d8e","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-24857"},{"url":"https://github.com/advisories/GHSA-q5c4-rqq9-f524"}],"sources":{"cve":[{"id":"CVE-2021-24857","title":"ToTop Link \u003c= 1.7.1 - Unauthenticated PHP Object Injection","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.","status":"published","published":"2021-12-13T10:41:09Z","modified":"2024-08-03T19:42:17.347Z","cwes":["CWE-502"],"updated_at":"2026-11-02T14:33:05.000797Z"}],"euvd":[{"id":"EUVD-2021-11769","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.","status":"published","published":"2021-12-13T10:41:09Z","modified":"2024-08-03T19:42:17Z","updated_at":"2026-11-03T03:24:55.415131Z"}],"ghsa":[{"id":"GHSA-q5c4-rqq9-f524","title":"The ToTop Link WordPress plugin through 1.7.1 passes base64 encoded user input to the unserialize...","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.","status":"published","published":"2021-12-14T00:01:01Z","modified":"2023-02-01T05:06:51Z","cwes":["CWE-502"],"updated_at":"2026-11-02T14:50:26.062502Z"}],"nvd":[{"id":"CVE-2021-24857","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.","status":"published","published":"2021-12-13T11:15:09.117Z","modified":"2026-06-17T03:41:01.49Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:07:02.189991Z"}]}}