CASCACascade Atlas

Evidence dossier

CVE-2023-5631

Stored XSS vulnerability in Roundcube

70.9–87.7Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Oct 18, 2023
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

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

FIRST EPSS75.87%

2026-07-18 · v2026.06.15 · percentile 99.5%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

ESEToriginal assertion
container

Stored XSS vulnerability in Roundcube

CISA KEVoriginal assertion
observed_exploitation

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.758730000000; percentile 0.994740000000

Applicability

Cited product scope

Trace impact →
RoundcubeRoundcubemail
[{"status": "affected", "version": "1.6.0", "lessThan": "1.6.3", "versionType": "semver"}, {"status": "affected", "version": "1.5.0", "lessThan": "1.5.4", "versionType": "semver"}, {"status": "affected", "version": "1.4.0", "lessThan": "1.5.14", "versionType": "semver"}, {"status": "unaffected", "version": "1.6.4"}, {"status": "unaffected", "version": "1.5.5"}, {"status": "unaffected", "version": "1.5.15"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*; end excluding 1.4.15supported
Unknown vendorUnknown product
cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*; start including 1.5.0; end excluding 1.5.5supported
Unknown vendorUnknown product
cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*; start including 1.6.0; end excluding 1.6.4supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

5.4
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.1
security@eset.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1
ESETCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.