CVE-2023-5631

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.769 · 100 %ileDEEURUUS
grimoire priorityP0 · Act now
Exploitable?
Yes · in the wild
CISA KEV
Likely / severe?
76.9% (100th) EPSS
CVSS 5.4 · medium
Is it mine?
22 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

added 2023-10-26remediate by 2023-11-16

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

EPSS · scored 2026-10-24

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Roundcube before 1.4.15, 1.5.x before 1.5.5, and 1.6.x before 1.6.4 allows stored XSS via an HTML e-mail message with a crafted SVG document because of program/lib/Roundcube/rcube_washtml.php behavior. This could allow a remote attacker to load arbitrary JavaScript code.

01

cvss

Technical severity, 0–10. One row per scoring source.

6.1
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.3 · impact 2.7
v3.15.4mediumAV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · ENISA EU
v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · security@eset.comexploitability 2.8 · impact 2.7
v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:Hsecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US
04

ATT&CK techniques

ATT&CK techniques this enables or maps to.

05

affected products (22)

Products and version ranges known to be affected.

showing 20 of 22
06

advisories (2)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2023-2657Roundcube: Schwachstelle ermöglicht Cross-Site ScriptingDeutsch2023-10-16csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Roundcube ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

  • BIT-roundcube-2023-56312024-03-06vendor · osvUS

    Roundcube before 1.4.15, 1.5.x before 1.5.5, and 1.6.x before 1.6.4 allows stored XSS via an HTML e-mail message with a crafted SVG document because of program/lib/Roundcube/rcube_washtml.php behavior. This could allow a remote attackerto load arbitrary JavaScript code.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundnvdosvNVDCVE.orgMITRE
published 2023-10-18modified 2026-06-17
10

references (49)

External citations — patches, advisories, analysis.

scry

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