Exploitation evidence
Known exploited · CISA KEV listed
Added 2023-10-26. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date: 2023-11-16. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Roundcube / Roundcubemail
Default status: unaffected
- affected: 1.6.0 to < 1.6.3 (semver)
- affected: 1.5.0 to < 1.5.4 (semver)
- affected: 1.4.0 to < 1.5.14 (semver)
- unaffected: 1.6.4
- unaffected: 1.5.5
- unaffected: 1.5.15
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://github.com/roundcube/roundcubemail/commit/6ee6e7ae301e165e2b2cb703edf75552e5376613
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.4
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.5
- https://github.com/roundcube/roundcubemail/releases/tag/1.4.15
- https://github.com/roundcube/roundcubemail/issues/9168
- https://roundcube.net/news/2023/10/16/security-update-1.6.4-released
- https://github.com/roundcube/roundcubemail/commit/41756cc3331b495cc0b71886984474dc529dd31d
- https://roundcube.net/news/2023/10/16/security-updates-1.5.5-and-1.4.15
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054079
- https://www.debian.org/security/2023/dsa-5531
- https://lists.debian.org/debian-lts-announce/2023/10/msg00035.html
- http://www.openwall.com/lists/oss-security/2023/11/01/1
- http://www.openwall.com/lists/oss-security/2023/11/01/3
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LK67Q46OIEGJCRQUBHKLH3IIJTBNGGX4/
- http://www.openwall.com/lists/oss-security/2023/11/17/2
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-5631
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.76337,
"percentile": 0.99545
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.76337,
"percentile": 0.99541
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.76337,
"percentile": 0.99541
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.76337,
"percentile": 0.99541
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.76337,
"percentile": 0.99541
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.76337,
"percentile": 0.99541
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.76337,
"percentile": 0.9954
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.76337,
"percentile": 0.9954
}04 Nov 2026, 18:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-02T08:07:32.513Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://github.com/roundcube/roundcubemail/commit/6ee6e7ae301e165e2b2cb703edf75552e5376613"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.4"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.5.5"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.4.15"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/roundcube/roundcubemail/issues/9168"
},
{
"tags": [
"x_transferred"
],
"url": "https://roundcube.net/news/2023/10/16/security-update-1.6.4-released"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/roundcube/roundcubemail/commit/41756cc3331b495cc0b71886984474dc529dd31d"
},
{
"tags": [
"x_transferred"
],
"url": "https://roundcube.net/news/2023/10/16/security-updates-1.5.5-and-1.4.15"
},
{
"tags": [
"x_transferred"
],
"url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054079"
},
{
"tags": [
"x_transferred"
],
"url": "https://www.debian.org/security/2023/dsa-5531"
},
{
"tags": [
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00035.html"
},
{
"tags": [
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2023/11/01/1"
},
{
"tags": [
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2023/11/01/3"
},
{
"tags": [
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LK67Q46OIEGJCRQUBHKLH3IIJTBNGGX4/"
},
{
"tags": [
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2023/11/17/2"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2023-5631",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2023-11-15T16:39:21.592115Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2023-10-26",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-5631"
},
"type": "kev"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-10-21T23:05:34.074Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-5631"
}
],
"timeline": [
{
"lang": "en",
"time": "2023-10-26T00:00:00.000Z",
"value": "CVE-2023-5631 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Roundcubemail",
"repo": "https://github.com/roundcube/roundcubemail",
"vendor": "Roundcube",
"versions": [
{
"lessThan": "1.6.3",
"status": "affected",
"version": "1.6.0",
"versionType": "semver"
},
{
"lessThan": "1.5.4",
"status": "affected",
"version": "1.5.0",
"versionType": "semver"
},
{
"lessThan": "1.5.14",
"status": "affected",
"version": "1.4.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "1.6.4"
},
{
"status": "unaffected",
"version": "1.5.5"
},
{
"status": "unaffected",
"version": "1.5.15"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Matthieu Faou"
},
{
"lang": "en",
"type": "finder",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Denys Klymenko"
},
{
"lang": "en",
"type": "remediation developer",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Aleksander Machniak"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "<div>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\n\nto load arbitrary JavaScript code.<br></div><div><br></div>"
}
],
"value": "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\n\nto load arbitrary JavaScript code."
}
],
"exploits": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Actively used in the wild.\n\n<br>"
}
],
"value": "Actively used in the wild."
}
],
"impacts": [
{
"capecId": "CAPEC-592",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-592 Stored XSS"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-11-17T15:06:13.428Z",
"orgId": "4a9b9929-2450-4021-b7b9-469a0255b215",
"shortName": "ESET"
},
"references": [
{
"url": "https://github.com/roundcube/roundcubemail/commit/6ee6e7ae301e165e2b2cb703edf75552e5376613"
},
{
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.6.4"
},
{
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.5.5"
},
{
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.4.15"
},
{
"url": "https://github.com/roundcube/roundcubemail/issues/9168"
},
{
"url": "https://roundcube.net/news/2023/10/16/security-update-1.6.4-released"
},
{
"url": "https://github.com/roundcube/roundcubemail/commit/41756cc3331b495cc0b71886984474dc529dd31d"
},
{
"url": "https://roundcube.net/news/2023/10/16/security-updates-1.5.5-and-1.4.15"
},
{
"url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054079"
},
{
"url": "https://www.debian.org/security/2023/dsa-5531"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00035.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2023/11/01/1"
},
{
"url": "http://www.openwall.com/lists/oss-security/2023/11/01/3"
},
{
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LK67Q46OIEGJCRQUBHKLH3IIJTBNGGX4/"
},
{
"url": "http://www.openwall.com/lists/oss-security/2023/11/17/2"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Stored XSS vulnerability in Roundcube",
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
}
},
"cveMetadata": {
"assignerOrgId": "4a9b9929-2450-4021-b7b9-469a0255b215",
"assignerShortName": "ESET",
"cveId": "CVE-2023-5631",
"datePublished": "2023-10-18T14:51:18.443Z",
"dateReserved": "2023-10-18T06:50:57.504Z",
"dateUpdated": "2025-10-21T23:05:34.074Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.76337,
"percentile": 0.99539
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.76337,
"percentile": 0.99539
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2023-5631",
"cwes": [
"CWE-79"
],
"dateAdded": "2023-10-26",
"dueDate": "2023-11-16",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://roundcube.net/news/2023/10/16/security-update-1.6.4-released, https://roundcube.net/news/2023/10/16/security-updates-1.5.5-and-1.4.15 ; https://nvd.nist.gov/vuln/detail/CVE-2023-5631",
"product": "Webmail",
"requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that allows a remote attacker to run malicious JavaScript code.",
"vendorProject": "Roundcube",
"vulnerabilityName": "Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability"
}