CVE-2026-35541Network attack vector

Authenticated password change via loose comparison

Published Apr 3, 2026 · Updated Apr 3, 2026

Type confusion in Roundcube Webmail before 1.5.14 and 1.6.0 through 1.6.13 allows remote authenticated users to change passwords. The password plugin's _compare method uses PHP's loose equality and inequality operators on current and new password values, allowing incompatible types to compare as equal. A valid Roundcube session and an enabled password plugin are required; bypassing the old-password check permits an account password reset and can preserve unauthorized account access.

CVSS severity4.2
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Roundcube Webmail before 1.5.14 and 1.6.0 through 1.6.13 allows remote authenticated users to change passwords. The password plugin's _compare method uses PHP's loose equality and inequality operators on current and new password values, allowing incompatible types to compare as equal. A valid Roundcube session and an enabled password plugin are required; bypassing the old-password check permits an account password reset and can preserve unauthorized account access.

The record

CVE
CVE-2026-35541
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
Roundcube
Product
Roundcube Webmail
Classifications
CWE-843, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.5.14
  2. Affected versionversion=1.6.0 <1.6.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Roundcube · Roundcube Webmailversion=0 <1.5.14; version=1.6.0 <1.6.14

Published CVSS scores

4.2MITRECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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