Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)12 Feb 2024
- Exploited in EUVD (ENISA)12 Feb 2024
- Used by ransomwareno
- EPSS above 10 %63.7%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Affected products
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
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EPSS peak: 63.7%
References
Other exploited vulnerabilities from the same vendor
- CVE-2025-68461RoundCube Webmail Cross-site Scripting Vulnerability6.1 · Background exploitation
- CVE-2025-49113RoundCube Webmail Deserialization of Untrusted Data Vulnerability8.7 · Background exploitation
- CVE-2024-42009RoundCube Webmail Cross-Site Scripting Vulnerability8.6 · Background exploitation
- CVE-2024-37383RoundCube Webmail Cross-Site Scripting (XSS) Vulnerability7.1 · Background exploitation
- CVE-2020-13965Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability7.2 · Background exploitation
- CVE-2023-5631Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability7.1 · Background exploitation