CVE-2023-5631
Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 16 November 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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.
- CVSS 3.1
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 76.34% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 26 October 2023 · due 16 November 2023
- Weakness
- CWE-79
- Affected
- roundcube/webmail · debian/debian linux · fedoraproject/fedora
- Source
- security@eset.com
EPSS moved from 76.9% on 19 October 2026 to 76.3% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. 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
References
- http://www.openwall.com/lists/oss-security/2023/11/01/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/11/01/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/11/17/2Mailing List, Third Party Advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054079Mailing List, Patch
- https://github.com/roundcube/roundcubemail/commit/41756cc3331b495cc0b71886984474dc529dd31dPatch
- https://github.com/roundcube/roundcubemail/commit/6ee6e7ae301e165e2b2cb703edf75552e5376613Patch
- https://github.com/roundcube/roundcubemail/issues/9168Exploit, Issue Tracking
- https://github.com/roundcube/roundcubemail/releases/tag/1.4.15Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.5Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.4Release Notes
- https://lists.debian.org/debian-lts-announce/2023/10/msg00035.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LK67Q46OIEGJCRQUBHKLH3IIJTBNGGX4/Mailing List
- https://roundcube.net/news/2023/10/16/security-update-1.6.4-releasedRelease Notes
- https://roundcube.net/news/2023/10/16/security-updates-1.5.5-and-1.4.15Release Notes
- https://www.debian.org/security/2023/dsa-5531Mailing List
- http://www.openwall.com/lists/oss-security/2023/11/01/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/11/01/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/11/17/2Mailing List, Third Party Advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054079Mailing List, Patch
- https://github.com/roundcube/roundcubemail/commit/41756cc3331b495cc0b71886984474dc529dd31dPatch
- https://github.com/roundcube/roundcubemail/commit/6ee6e7ae301e165e2b2cb703edf75552e5376613Patch
- https://github.com/roundcube/roundcubemail/issues/9168Exploit, Issue Tracking
- https://github.com/roundcube/roundcubemail/releases/tag/1.4.15Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.5Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.4Release Notes
- https://lists.debian.org/debian-lts-announce/2023/10/msg00035.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LK67Q46OIEGJCRQUBHKLH3IIJTBNGGX4/Mailing List
- https://roundcube.net/news/2023/10/16/security-update-1.6.4-releasedRelease Notes
- https://roundcube.net/news/2023/10/16/security-updates-1.5.5-and-1.4.15Release Notes
- https://www.debian.org/security/2023/dsa-5531Mailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.