CVE-2026-48846

MEDIUM

6.5

CVSS v3

Description

In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, the remote image blocking feature can be bypassed via a crafted CSS var() value in an e-mail message, which may lead to information disclosure or access-control bypass.

CWE-669

How to fix

Remediation Available

roundcubeDebian

Fixed in:1.4.15+dfsg.1-1+deb11u9CVE-2026-48846

Fixed in:1.6.5+dfsg-1+deb12u9CVE-2026-48846

Fixed in:1.6.16+dfsg-0+deb13u1CVE-2026-48846

Fixed in:1.6.16+dfsg-1CVE-2026-48846

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploit Intelligence

0.40%probability of exploitation in 30 days

33rdpercentile

Low risk: more likely to be exploited than 33% of all known CVEs.

References

Other references5

Related Vulnerabilities

Other CWE-669 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-31431	Medium	5.5	100%	KEV	Fix
CVE-2002-0055	Medium	5.0	35%	-	-
CVE-2020-1048	High	7.8	17%	-	-
CVE-2021-22900	High	7.2	14%	KEV	-
CVE-2026-25253	High	8.8	8.0%	-	Fix
CVE-2020-6862	Medium	5.3	6.3%	-	-

Common questions

How do I fix CVE-2026-48846?

Upgrade roundcube on debian 11 to 1.4.15+dfsg.1-1+deb11u9 or later.

Is CVE-2026-48846 being actively exploited?

Not that we know of. CVE-2026-48846 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.40% is the estimated probability that it will be exploited in the next 30 days. That is higher than 33% of all scored CVEs.

How severe is CVE-2026-48846?

CVE-2026-48846 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-48846 affect?

Published advisories record a fix for roundcube (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-24.