CVE-2021-46144Network attack vector

Script execution via unescaped CSS attribute suffix

Published Jan 6, 2022 · Updated Aug 4, 2024

Cross-site scripting in Roundcube before 1.4.13 and 1.5.0 through 1.5.1 allows remote attackers to execute script via a crafted HTML email. The wash_attribs method sanitizes a CSS URL but appends the remaining attribute text without HTML escaping, allowing a quote to terminate the attribute and inject an event handler. The attack requires a recipient to open or render the crafted message, and the injected script is limited to the victim's webmail-origin privileges.

CVSS severity6.1
Medium
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Roundcube before 1.4.13 and 1.5.0 through 1.5.1 allows remote attackers to execute script via a crafted HTML email. The wash_attribs method sanitizes a CSS URL but appends the remaining attribute text without HTML escaping, allowing a quote to terminate the attribute and inject an event handler. The attack requires a recipient to open or render the crafted message, and the injected script is limited to the victim's webmail-origin privileges.

The record

CVE
CVE-2021-46144
Published
Jan 6, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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