CVE-2026-48848Network attack vector

CSS injection via unsanitized SVG animation values

Published May 25, 2026 · Updated May 25, 2026

CSS injection in Roundcube Webmail 1.6.0 through 1.6.15 and 1.7.0 allows remote attackers to alter webmail content via crafted SVG. The rcube_washtml.php wash_attribs sanitizer accepts an SVG animate element whose attributeName is style without passing its values attribute through wash_style. No Roundcube account is required; rendering the crafted SVG applies attacker-controlled CSS that can alter displayed content or trigger a browser request.

CVSS severity7.2
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSS injection in Roundcube Webmail 1.6.0 through 1.6.15 and 1.7.0 allows remote attackers to alter webmail content via crafted SVG. The rcube_washtml.php wash_attribs sanitizer accepts an SVG animate element whose attributeName is style without passing its values attribute through wash_style. No Roundcube account is required; rendering the crafted SVG applies attacker-controlled CSS that can alter displayed content or trigger a browser request.

The record

CVE
CVE-2026-48848
Published
May 25, 2026
Updated
May 25, 2026
Vendor
Roundcube
Product
Roundcube Webmail
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 25, 2026CVE publishedPublication date reported by the CVE source.
  2. May 25, 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=1.6.0 <1.6.16
  2. Affected versionversion=1.7.0 <1.7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Roundcube · Roundcube Webmailversion=1.6.0 <1.6.16; version=1.7.0 <1.7.1

Published CVSS scores

7.2MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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