CVE-2026-35541: Roundcube Webmail Incorrect Password Comparison Vulnerability

MODERATE
Advisory Identifier: GHSA-46pv-mj2g-93gh
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CVSS 4.2
CWE-843
Published
Advisory Summary

CVE-2026-35541 is a MODERATE (CVSS 4.2) incorrect password comparison vulnerability (CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')) affecting Roundcube Webmail libraries in the Packagist ecosystem. The issue involves incorrect password comparison in the password plugin. Remediation is available by upgrading affected packages to version 1.7-rc5.

CVE-2026-35541 at a Glance

CVE Identifier CVE-2026-35541
GHSA Identifier GHSA-46pv-mj2g-93gh
Severity MODERATE
CVSS v3.1 Base Score 4.2
CWE Classification CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
Affected Product Roundcube Webmail
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.2

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-35541

To remediate this vulnerability, upgrade all affected Roundcube Webmail dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

roundcube/roundcubemail fixed: 1.7-rc5 
Upgrade roundcube/roundcubemail to 1.7-rc5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for roundcube/roundcubemail

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-35541, inspect your project dependencies for Roundcube Webmail:

inspect dependencies for roundcube/roundcubemail

Analyze the terminal output to locate any version of Roundcube Webmail in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.7-rc5), 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-843: Access of Resource Using Incompatible Type ('Type Confusion'), where the product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. In Roundcube Webmail, 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

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Incorrect password comparison in the password plugin could lead to type confusion that allows a password change without knowing the old password.

CVE-2026-35541 Affected Roundcube Webmail Versions

1 component(s)
Fixed Versions:
1.7-rc5
Product / Package Ecosystem Affected Versions Fixed Version
roundcube/roundcubemail
 Packagist
≥ 1.7-beta
< 1.7-rc5
1.7-rc5

References

NVD — CVE-2026-35541 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35541
Security Fix Commit FIX COMMIT
https://github.com/roundcube/roundcubemail/commit/2e6a99b2a38110907ea8d3be8e59ec3d5802c394
Security Fix Commit FIX COMMIT
https://github.com/roundcube/roundcubemail/commit/6a275676a8043083c05c961914d830b79e2490d4
Security Fix Commit FIX COMMIT
https://github.com/roundcube/roundcubemail/commit/6fa2bddc59b9c9fd31cad4a9e2954a208d793dce
Roundcube Webmail Source Repository REPOSITORY
https://github.com/roundcube/roundcubemail
Roundcube Webmail Release RELEASE
https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
Roundcube Webmail Release RELEASE
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
Roundcube Webmail Release RELEASE
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
Roundcube Webmail Security Information SECURITY
https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14

Frequently Asked Questions

What is CVE-2026-35541?
CVE-2026-35541 is a security vulnerability in Roundcube Webmail involving Incorrect password comparison in the password plugin under CWE-843: Access of Resource Using Incompatible Type ('Type Confusion').
Which Roundcube Webmail versions are affected?
Affected versions include releases prior to 1.7-rc5 across affected packages: roundcube/roundcubemail.
What version fixes CVE-2026-35541?
Upgrading to 1.7-rc5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is roundcube/roundcubemail affected?
Yes, roundcube/roundcubemail is affected in releases prior to 1.7-rc5. Upgrade your dependency to 1.7-rc5 or later.
What is the CVSS score of CVE-2026-35541?
CVE-2026-35541 has a CVSS v3.1 base score of 4.2 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-35541?
CVE-2026-35541 is classified under CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') (The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.).
How can I check Packagist dependencies for CVE-2026-35541?
Run the dependency tree command: 'inspect dependencies for roundcube/roundcubemail'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-46pv-mj2g-93gh",
  "modified" : "2026-04-04T06:54:24Z",
  "published" : "2026-04-03T06:31:32Z",
  "aliases" : [ "CVE-2026-35541" ],
  "summary" : "Roundcube Webmail: Incorrect password comparison in the password plugin",
  "details" : "An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Incorrect password comparison in the password plugin could lead to type confusion that allows a password change without knowing the old password.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "roundcube/roundcubemail"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.7-beta"
      }, {
        "fixed" : "1.7-rc5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35541"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/roundcube/roundcubemail/commit/2e6a99b2a38110907ea8d3be8e59ec3d5802c394"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/roundcube/roundcubemail/commit/6a275676a8043083c05c961914d830b79e2490d4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/roundcube/roundcubemail/commit/6fa2bddc59b9c9fd31cad4a9e2954a208d793dce"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/roundcube/roundcubemail"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/roundcube/roundcubemail/releases/tag/1.5.14"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/roundcube/roundcubemail/releases/tag/1.6.14"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5"
  }, {
    "type" : "WEB",
    "url" : "https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-843" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-04T06:54:24Z",
    "nvd_published_at" : "2026-04-03T05:16:22Z"
  }
}