CVE-2024-42009
CriticalExploitedPublic exploitA Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails of a victim via a crafted e-mail message that abuses a Desanitization issue in message_body() in program/actions/mail/show.php.
Published Aug 5, 2024 · Updated Sep 17, 2026 · Also known as DEBIAN-CVE-2024-42009, UBUNTU-CVE-2024-42009, USN-7636-1
Key Facts
Patch immediately- CVE-2024-42009 is a critical-severity vulnerability (CVSS 9.3 v3.1) affecting Webmail (Roundcube), roundcube (debian), roundcube-core (ubuntu) and 5 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 5, 2025. Public exploit code is available.
- EPSS estimates a 83% probability of exploitation in the next 30 days.
- Fixed versions are available, including roundcube 1.4.15+dfsg.1-1+deb11u4, roundcube 1.6.5+dfsg-1+deb12u3, roundcube 1.6.6+dfsg-2ubuntu0.1+esm1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
EPSS (30-day exploit likelihood)
83%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2024-42009 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails of a victim via a crafted e-mail message that abuses a Desanitization issue in message_body() in program/actions/mail/show.php.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jun 9, 2025 | Jun 30, 2025 | Not reported |
| Industry KEV feed | Jun 5, 2025 | Jun 30, 2025 | Not reported |
| CIRCL KEV | Jun 9, 2025 | Jun 30, 2025 | Not reported |
| ENISA EUVD | Jun 9, 2025 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
24 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WebmailRoundcube | See advisory | 1.5.8 |
| roundcubedebian | See advisory | 1.4.15+dfsg.1-1+deb11u4 |
| roundcube-coreubuntu | See advisory | 1.6.6+dfsg-2ubuntu0.1+esm1 |
| roundcube-mysqlubuntu | See advisory | 1.6.6+dfsg-2ubuntu0.1+esm1 |
| roundcube-pgsqlubuntu | See advisory | 1.6.6+dfsg-2ubuntu0.1+esm1 |
Patched Releases
roundcube
1.4.15+dfsg.1-1+deb11u4, 1.6.5+dfsg-1+deb12u3, 1.6.6+dfsg-2ubuntu0.1+esm1, 1.6.8+dfsg-1
Webmail
1.5.8
roundcube-core
1.6.6+dfsg-2ubuntu0.1+esm1
roundcube-mysql
1.6.6+dfsg-2ubuntu0.1+esm1
roundcube-pgsql
1.6.6+dfsg-2ubuntu0.1+esm1
roundcube-plugins
1.6.6+dfsg-2ubuntu0.1+esm1
roundcube-sqlite3
1.6.6+dfsg-2ubuntu0.1+esm1
roundcubemail
1.6.8-1.1, 1.6.8-bp156.2.3.1
Timeline
Publicly disclosed
Aug 5, 2024
Added to Industry KEV feed
Jun 5, 2025
Added to CISA KEV
Jun 9, 2025
Added to CIRCL KEV
Jun 9, 2025
Added to ENISA EUVD
Jun 9, 2025
Last updated
Sep 17, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42009.json
- advisoryhttps://github.com/roundcube/roundcubemail/commit/68af7c864a36e1941764238dac440ab0d99a8d26
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2024-42009
- advisoryhttps://roundcube.net/news/2024/08/04/security-updates-1.6.8-and-1.5.8
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2024-42009
FAQ
Common Questions.
A Cross-Site Scripting vulnerability in Roundcube through 1.5.7 and 1.6.x through 1.6.7 allows a remote attacker to steal and send emails of a victim via a crafted e-mail message that abuses a Desanitization issue in message_body() in program/actions/mail/show.php.
Affected: Webmail (Roundcube); roundcube (debian); roundcube-core (ubuntu), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 5, 2025.
Yes. It was added on Jun 9, 2025 with a federal remediation due date of Jun 30, 2025.
Public exploit code is available.
Fixed versions are available, including roundcube 1.4.15+dfsg.1-1+deb11u4, roundcube 1.6.5+dfsg-1+deb12u3, roundcube 1.6.6+dfsg-2ubuntu0.1+esm1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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