What it is
CVE-2024-42009 is an unauthenticated vulnerability affecting Roundcube Roundcube Webmail. 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...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2024-42009
Roundcube Webmail Cross-Site Scripting
Roundcube / Roundcube Webmail
- Severity
- CVSS 9.3 · Critical
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 79.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Roundcube / Roundcube Webmail.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Roundcube Webmail Cross-Site Scripting
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.
- Published
- 05 Aug 2024
- Exploitation Reported
- 01 Jun 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
Tags
nuclei_scanner
php
cisa
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2024-42009
- GitHub — roundcube/roundcubemail github.com · CVE Record https://github.com/roundcube/roundcubemail/releases
- sonarsource.com/blog/government-emails-at-risk-critical-cros... sonarsource.com · CVE Record https://sonarsource.com/blog/government-emails-at-risk-critical-cross...
- GitHub — roundcube/roundcubemail github.com · CVE Record https://github.com/roundcube/roundcubemail/releases/tag/1.5.8
- GitHub — roundcube/roundcubemail github.com · CVE Record https://github.com/roundcube/roundcubemail/releases/tag/1.6.8
- roundcube.net/news/2024/08/04/security-updates-1.6.8-and-1... roundcube.net · CVE Record https://roundcube.net/news/2024/08/04/security-updates-1.6.8-and-1.5.8
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Proof of concept available
GitHub
Public scanner or PoC coverage increases practical exploitability.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-01 10:32 UTC |
| CISA | 2026-06-02 14:07 UTC |
| TheHackerNews | 2026-07-07 10:20 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
Nuclei template detected 01 Jun 2026.
View Nuclei template (opens in new tab)Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-42009.yaml | 01 Jun 2026 |
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
9.3
Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
EPSS
79.6%
Weaknesses
Recent mention · TheHackerNews
Suspected China-Aligned Hackers Exploit Roundcube Flaws Against Universities
A suspected China-aligned threat activity cluster has been observed exploiting Roundcube webmail software belonging to physics and engineering departments of U.S. and Canadian universities as part of a new campaign. The activity involves the exploitation of now-patched,...
Read full advisoryPotential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
Roundcube Webmail - Cross-Site Scripting
nuclei · Created Unknown
Timeline
From disclosure to observed exploitation
-
KEV confirmed by TheHackerNews
Exploitation attested by an external source
-
Public PoC available
Public proof-of-concept code published
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
Nuclei template available
Scanner coverage available
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2024-42009
Free JSON includes basic KEV fields{
"cve_id": "CVE-2024-42009",
"confidence": "Confirmed",
"cvss_score": 9.3,
"cvss_estimated": false,
"epss_score": 0.79624,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.