Skip to main content
Threat Radar animated logo

In Roundcube Webmail 1.6.x between 1.6.14 and 1.6.16 and 1.7.x before 1.7.1, remote image blocking was not honored for URLs pointing to… (CVE-2026-48845)

0
Medium
VulnerabilityCVE-2026-48845gcveosvubuntu-cve-2026-48845cve-2026-48845ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-25-10ubuntu-26-10ubuntu-pro-26-04-lts
Published: 05/25/2026 (05/25/2026, 20:16:00 UTC)
Source: GCVE Database
Product: roundcube

Description

Roundcube Webmail versions 1.6.x between 1.6.14 and 1.6.16 and 1.7.x before 1.7.1 do not properly honor remote image blocking for URLs pointing to local or private destinations. This flaw may allow information disclosure or privilege escalation when processing text/html email messages.

CVSS v3.1

Score 6.5medium

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

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:25.10more threats →ghsa
roundcube
pkg:deb/ubuntu/roundcube?arch=source&distro=questing
Affected versions
=1.6.10+dfsg-1=1.6.10+dfsg-2=1.6.11+dfsg-1
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, 01:05:37 UTC

Technical Analysis

CVE-2026-48845 affects Roundcube Webmail in versions 1.6.x from 1.6.14 through 1.6.16 and 1.7.x prior to 1.7.1. The vulnerability arises because remote image blocking is not enforced for URLs that point to local or private network destinations. This can lead to unintended information disclosure or privilege escalation through crafted HTML email content that bypasses the intended image blocking controls.

Potential Impact

The vulnerability can result in information disclosure or privilege escalation due to the failure to block remote images from local/private URLs in email messages. This could allow an attacker to bypass security controls designed to prevent leaking sensitive information or escalating privileges via email content.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.

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-2026-48845
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:25.10","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ad3f61d2cdf04f6566641a5

Added to database: 10/17/2026, 22:26:37 UTC

Last enriched: 10/18/2026, 01:05:37 UTC

Last updated: 10/18/2026, 01:05:37 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