{"cve":"CVE-2022-24880","nvd":{"published":"2022-04-25T22:15:43.883","modified":"2026-06-17T04:32:43.140","status":"Modified","description":"flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g. by submitting an having an empty form). If implementing users were checking the return value to be **False**, the captcha verification check could be bypassed. Version 1.2.1 fixes the issue. Users can workaround the issue by not explicitly checking that the value is False. Checking the return value less explicitly should still work.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-754","CWE-253","CWE-394"],"references":["https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4","https://github.com/Tethik/flask-session-captcha/pull/27","https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1","https://github.com/Tethik/flask-session-captcha/security/advisories/GHSA-7r87-cj48-wj45","https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4"],"products":["flask-session-captcha_project:flask-session-captcha"],"source":"nvd","synced_at":"2026-10-19T21:30:03.577988018+00:00"},"epss":{"cve":"CVE-2022-24880","score":0.01206,"percentile":0.68335,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-7r87-cj48-wj45","url":"https://osv.dev/vulnerability/GHSA-7r87-cj48-wj45","summary":"Potential Captcha Validate Bypass in flask-session-captcha","modified":"2025-02-21T05:28:13.664287Z","packages":[{"ecosystem":"PyPI","name":"flask-session-captcha","purl":"pkg:pypi/flask-session-captcha","ranges":["<1.2.1"],"fixed":["1.2.1"]}]},{"id":"PYSEC-2022-193","url":"https://osv.dev/vulnerability/PYSEC-2022-193","summary":"","modified":"2023-11-08T04:08:39.356991Z","packages":[{"ecosystem":"PyPI","name":"flask-session-captcha","purl":"pkg:pypi/flask-session-captcha","ranges":["<1.2.1"],"fixed":["1.2.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}