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Weakness (CWE)

CWE-565: Reliance on Cookies without Validation and Integrity Checking

Base Incomplete

The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user.

How to prevent it (4 mitigations)

  1. Architecture and Design

    Avoid using cookie data for a security-related decision.

  2. Implementation

    Perform thorough input validation (i.e.: server side validation) on the cookie data if you're going to use it for a security related decision.

  3. Architecture and Design

    Add integrity checks to detect tampering.

  4. Architecture and Design

    Protect critical cookies from replay attacks, since cross-site scripting or other attacks may allow attackers to steal a strongly-encrypted cookie that also passes integrity checks. This mitigation applies to cookies that should only be valid during a single transaction or session. By enforcing timeouts, you may limit the scope of an attack. As part of your integrity check, use an unpredictable, server-side value that is not exposed to the client.

Source: MITRE CWE-565

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  • Medium 6.3
    CVE-2026-8337 Public exploit

    Concrete CMS 9.5.0 and below is vulnerable to IDOR in surveys when sites are running concurrent public surveys and private surveys

    Concrete CMS 9.5.0 and below is vulnerable to IDOR in surveys. To be vulnerable, a site would have to be configured in such a way that both public and private surveys are present on the site. An unauthenticated attacker can vote in the restricted survey by su…

    Concrete CMS Concrete CMS concrete5/concrete5 Packagist