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Response snapshot Oct 26, 2026, 23:46 UTC

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VulnerabilityCVE-2023-43770Known exploitation

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
Not scored yet
Chance of exploitation
63.7% in the next 30 days
CISA federal deadline
Mar 4, 2024: passed
Sources
1 source

What to do

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Read CISA KEV entry CVE-2023-43770 (opens a new tab)

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Unknown
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

Not available

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

63.7%

Scored Percentile 99.2%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    CISA KEV entry CVE-2023-43770 (opens a new tab)

    The CVE-2023-43770 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  2. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2023-43770, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2024, February 12). Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability (CVE-2023-43770). https://kevwire.com/record/CVE-2023-43770

MLA

"Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability (CVE-2023-43770)." KEVWire, 12 Feb. 2024, kevwire.com/record/CVE-2023-43770.

Chicago

KEVWire. "Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability (CVE-2023-43770)." Last modified February 12, 2024. https://kevwire.com/record/CVE-2023-43770.

Evidence summary (plain text)

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability (Feb 12, 2024).
Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.
EPSS 63.7% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2023-43770&date=2026-10-26).
Sources:
CISA KEV entry CVE-2023-43770: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2023-43770&date=2026-10-26
Record ID: CVE-2023-43770.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Mar 4, 2024. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 19:40 UTC. Ingestion is not an independent editorial investigation.

CISA added this entry on 2024-02-12. This record's publication date is the catalog addition date, not necessarily the initial vulnerability disclosure. KEV means known exploitation, not necessarily a zero-day. CISA due dates apply to covered US federal agencies, not your organizational SLA.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail