Skip to main content
Threat Radar animated logo

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the password plugin of the Roundcube Webmail was subject to username spoofing via session… (CVE-2026-62644)

0
Medium
VulnerabilityCVE-2026-62644gcveosvubuntu-cve-2026-62644cve-2026-62644ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-26-10ubuntu-pro-26-04-lts
Published: 07/14/2026 (07/14/2026, 16:17:00 UTC)
Source: GCVE Database
Product: roundcube

Description

Roundcube Webmail versions before 1.6.17 and 1.7.x before 1.7.2 have a vulnerability in the password plugin that allows username spoofing via session data. This flaw can lead to account takeover. The vulnerability has a high CVSS score of 9.8, indicating critical impact on confidentiality, integrity, and availability.

CVSS v3.1

Score 9.8critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/xenial
Affected versions
=1.1.1+dfsg.1-2=1.1.2+dfsg.1-5=1.1.3+dfsg.1-1=1.1.4+dfsg.1-1=1.2~beta+dfsg.1-0ubuntu1=1.2~beta+dfsg.1-0ubuntu1+esm1=1.2~beta+dfsg.1-0ubuntu1+esm2=1.2~beta+dfsg.1-0ubuntu1+esm3=1.2~beta+dfsg.1-0ubuntu1+esm4=1.2~beta+dfsg.1-0ubuntu1+esm5=1.2~beta+dfsg.1-0ubuntu1+esm6=1.2~beta+dfsg.1-0ubuntu1+esm7=1.2~beta+dfsg.1-0ubuntu1+esm8
Ubuntu:Pro:18.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/bionic
Affected versions
=1.3.0+dfsg.1-1=1.3.1+dfsg.1-1=1.3.3+dfsg.1-1=1.3.3+dfsg.1-2=1.3.6+dfsg.1-1=1.3.6+dfsg.1-1ubuntu0.1~esm1=1.3.6+dfsg.1-1ubuntu0.1~esm2=1.3.6+dfsg.1-1ubuntu0.1~esm3=1.3.6+dfsg.1-1ubuntu0.1~esm4=1.3.6+dfsg.1-1ubuntu0.1~esm5=1.3.6+dfsg.1-1ubuntu0.1~esm6=1.3.6+dfsg.1-1ubuntu0.1~esm7=1.3.6+dfsg.1-1ubuntu0.1~esm8
Ubuntu:Pro:20.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/focal
Affected versions
=1.3.8+dfsg.1-2=1.3.10+dfsg.1-1=1.4.1+dfsg.1-2=1.4.2+dfsg.1-1=1.4.2+dfsg.1-2=1.4.3+dfsg.1-1=1.4.3+dfsg.1-1ubuntu0.1~esm1=1.4.3+dfsg.1-1ubuntu0.1~esm2=1.4.3+dfsg.1-1ubuntu0.1~esm3=1.4.3+dfsg.1-1ubuntu0.1~esm4=1.4.3+dfsg.1-1ubuntu0.1~esm5=1.4.3+dfsg.1-1ubuntu0.1~esm6=1.4.3+dfsg.1-1ubuntu0.1~esm7=1.4.3+dfsg.1-1ubuntu0.1~esm8
Ubuntu:Pro:22.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/jammy
Affected versions
=1.4.11+dfsg.1-4=1.5.0+dfsg.1-2=1.5.0+dfsg.1-2ubuntu0.1~esm1=1.5.0+dfsg.1-2ubuntu0.1~esm2=1.5.0+dfsg.1-2ubuntu0.1~esm3=1.5.0+dfsg.1-2ubuntu0.1~esm4=1.5.0+dfsg.1-2ubuntu0.1~esm5=1.5.0+dfsg.1-2ubuntu0.1~esm6
Ubuntu:Pro:24.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/noble
Affected versions
=1.6.2+dfsg-1=1.6.4+dfsg-1=1.6.5+dfsg-1=1.6.6+dfsg-1=1.6.6+dfsg-2=1.6.6+dfsg-2ubuntu0.1=1.6.6+dfsg-2ubuntu0.1+esm1=1.6.6+dfsg-2ubuntu0.1+esm2=1.6.6+dfsg-2ubuntu0.1+esm3
Ubuntu:26.10more threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=stonking
Affected versions
=1.6.11+dfsg-1
Ubuntu:Pro:26.04:LTSmore threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=esm-apps/resolute
Affected versions
=1.6.11+dfsg-1=1.6.11+dfsg-1ubuntu0.26.04.1~esm1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 00:17:32 UTC

Technical Analysis

CVE-2026-62644 affects the password plugin in Roundcube Webmail versions prior to 1.6.17 and 1.7.x prior to 1.7.2. The vulnerability allows an attacker to spoof usernames through manipulation of session data, potentially resulting in account takeover. This is a critical security issue as it impacts user authentication and session integrity.

Potential Impact

Successful exploitation could allow an attacker to impersonate other users by spoofing usernames in session data, leading to unauthorized access and full account takeover. This compromises confidentiality, integrity, and availability of affected accounts.

Mitigation Recommendations

A fix is available in Roundcube Webmail versions 1.6.17 and 1.7.2 and later. Users and administrators should upgrade to these or newer versions to remediate the vulnerability. No vendor advisory content was provided to indicate alternative mitigations or temporary fixes.

Pro Console: star threats, build custom feeds, automate alerts via Slack, email & webhooks.Upgrade to Pro

Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-62644
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ad3f5c52cdf04f6566628e0

Added to database: 10/17/2026, 22:25:09 UTC

Last enriched: 10/18/2026, 00:17:32 UTC

Last updated: 10/18/2026, 00:17:32 UTC

Views: 2

Community Reviews

0 reviews

Crowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.

Sort by
Loading community insights…

Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.

Actions

PRO

Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.

Please log in to the Console to use AI analysis features.

Need more coverage?

Upgrade to Pro Console for AI refresh and higher limits.

For incident response and remediation, OffSeq services can help resolve threats faster.

Latest Threats

Breach by OffSeqOFFSEQFRIENDS — 25% OFF

Check if your credentials are on the dark web

Instant breach scanning across billions of leaked records. Free tier available.

Scan now
OffSeq TrainingCredly Certified

Lead Pen Test Professional

Technical5-day eLearningPECB Accredited
View courses