CVE-2022-24880

    Dashboard / Vulnerabilities / CVE-2022-24880

    CVE-2022-24880

    Published: 25 Apr 2022Last Modified: 12 Aug 2026

    Summary: Potential Captcha Validate Bypass in flask-session-captcha

    Details: 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.

    References: https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/24xxx/CVE-2022-24880.json, https://github.com/Tethik/flask-session-captcha/security/advisories/GHSA-7r87-cj48-wj45, https://nvd.nist.gov/vuln/detail/CVE-2022-24880, https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4, https://github.com/Tethik/flask-session-captcha/pull/27

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -18b74e77ce008a7c4b371ee37c03d8694b344968

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2022-24880 | CVE-DB