CVE-2024-42009
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.
do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Can a WAF block it? Yes. Cross-site scripting sends script tags or event handlers in the request, which WAF signatures match well.
Also consider: CSP · output encoding
Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2024-42009 being exploited?
Yes. CVE-2024-42009 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2024-42009?
CVE-2024-42009 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2024-42009?
Yes. A fix has been recorded for CVE-2024-42009. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2024-42009 affect?
CVE-2024-42009 affects roundcube:webmail. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
public exploits
Unvetted proof-of-concept code on GitHub: 6 GitHub proofs of concept · 1 Nuclei template
- Roundcube Webmail - Cross-Site Scripting · detection template · critical
- DaniTheHack3r/CVE-2024-42009-PoC · 8 ★
- 0xbassiouny1337/CVE-2024-42009 · 4 ★
- Bhanunamikaze/CVE-2024-42009 · 1 ★
- ZaidArif47/CVE-2024-42009 · 1 ★
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- no
- technical impact
- total
Assessed by CISA 20 Aug 2025 (SSVC 2.0.3).
timeline
- 5 Aug 2024Published
- 11 Feb 2025First proof-of-concept repository on GitHub (unvetted) · 189 days (about 6 months) later
- 9 Jun 2025Added to CISA KEV (exploited in the wild) · 118 days (about 4 months) later
- 30 Jun 2025CISA remediation due date (US federal agencies) · 21 days later
- 20 Aug 2025CISA SSVC assessment: exploitation active · 51 days later
- 21 Oct 2025CVE record last updated · 63 days (about 2 months) later
- 2 Nov 2026Analysed by vulneraibility.com · 377 days (about 1 year) later
- Linkgithub.com /roundcube/roundcubemail/releases
- Linksonarsource.com /blog/government-emails-at-risk-critical-cross-site-scripting-vulnerability-in-r
- Linkgithub.com /roundcube/roundcubemail/releases/tag/1.5.8
- Linkgithub.com /roundcube/roundcubemail/releases/tag/1.6.8
- Linkroundcube.net /news/2024/08/04/security-updates-1.6.8-and-1.5.8
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-42009
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Nuclei templates: detection templates
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.