CVE-2026-55590: CakePHP Authentication Open Redirect Weakness Vulnerability
MODERATECVE-2026-55590 is a MODERATE open redirect weakness vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting CakePHP Authentication libraries in the Packagist ecosystem. The issue involves open redirect weakness via backslash bypass. Remediation is available by upgrading affected packages to version 3.3.6, 4.1.1, 2.11.1.
CVE-2026-55590 at a Glance
How to Fix CVE-2026-55590
To remediate this vulnerability, upgrade all affected CakePHP Authentication dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade cakephp/authentication to 3.3.6Upgrade cakephp/authentication to 4.1.1Upgrade cakephp/authentication to 2.11.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for cakephp/authenticationHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-55590, inspect your project dependencies for CakePHP Authentication:
inspect dependencies for cakephp/authenticationAnalyze the terminal output to locate any version of CakePHP Authentication in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.6), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In CakePHP Authentication, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-55590 Affected CakePHP Authentication Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
cakephp/authentication
|
Packagist |
≥ 3.0.0
< 3.3.6
|
3.3.6
|
|
cakephp/authentication
|
Packagist |
≥ 4.0.0
< 4.1.1
|
4.1.1
|
|
cakephp/authentication
|
Packagist |
< 2.11.1
|
2.11.1
|
References
Frequently Asked Questions
What is CVE-2026-55590?
Which CakePHP Authentication versions are affected?
What version fixes CVE-2026-55590?
Is cakephp/authentication affected?
What CWE is associated with CVE-2026-55590?
How can I check Packagist dependencies for CVE-2026-55590?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-hhpq-7wg4-36jm",
"modified" : "2026-08-14T18:35:48Z",
"published" : "2026-06-17T18:52:09Z",
"aliases" : [ "CVE-2026-55590" ],
"summary" : "CakePHP Authentication: Open redirect weakness via backslash bypass",
"details" : "### Impact\nThe `getLoginRedirect()` method contains a weakness to backslash bypasses allowing redirect targets with attacker controlled hostnames.\n\n### Patches\n2.11.1, 3.3.6 and 4.1.1 contain a fix for this issue.\n\n### Workarounds\nIf you are unable to upgrade, you should consider adding application validation to the redirect query string parameter to mitigate this vulnerability.",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Packagist",
"name" : "cakephp/authentication"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.0.0"
}, {
"fixed" : "3.3.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "cakephp/authentication"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.0.0"
}, {
"fixed" : "4.1.1"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "cakephp/authentication"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.11.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/security/advisories/GHSA-hhpq-7wg4-36jm"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55590"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/pull/795"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/pull/796"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/pull/799"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/commit/1c1e29c7e8129cfbcae74558316ecd3ea50a8273"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/commit/df28ea4e712f1e5bd0e42be4a3c5c750ca50764d"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/commit/ee24bd48b9c3ef693dc9965de8f0cc8020a7052c"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/cakephp/authentication"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/releases/tag/2.11.1"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/releases/tag/3.3.6"
}, {
"type" : "WEB",
"url" : "https://github.com/cakephp/authentication/releases/tag/4.1.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-601" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-06-17T18:52:09Z",
"nvd_published_at" : "2026-07-09T19:17:06Z"
}
}