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Weakness (CWE)

CWE-1286: Improper Validation of Syntactic Correctness of Input

Base Incomplete

The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.

How to prevent it (1 mitigation)

  1. Implementation

    Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.

    When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."

    Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.

Source: MITRE CWE-1286

All Critical High Medium Low Exploited only Public exploit

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  • High 8.8
    CVE-2026-88009 Public exploit

    Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging

    Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sa…

    traefik traefik github.com/traefik/traefik github.com/traefik/traefik/v2 Go
  • High 8.6
    CVE-2026-50131 Public exploit

    Fedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 ranges

    Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the …

    fedify-dev fedify vocab-runtime @fedify/fedify npm
  • High 8.3
    CVE-2026-25513 Public exploit

    FacturaScripts has SQL Injection vulnerability in API ORDER BY Clause

    FacturaScripts is open-source enterprise resource planning and accounting software. Prior to version 2025.81, FacturaScripts contains a critical SQL injection vulnerability in the REST API that allows authenticated API users to execute arbitrary SQL queries t…

    NeoRazorX facturascripts facturascripts/facturascripts Packagist