RoundCube Webmail Cross-Site Scripting Vulnerability
Roundcube · Webmail
A cross-site scripting flaw in Roundcube Webmail, through 1.5.7 and 1.6.x through 1.6.7, lies in the message_body() function in program/actions/mail/show.php, where a desanitization issue lets crafted content slip past sanitization. A remote attacker who sends a specially crafted email can steal and send emails from a victim's account, provided the victim opens that message (user interaction required) and no authentication is needed from the attacker.
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.
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 3/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.How attackers get in
What they do
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 10 months after disclosure. Public exploit code (PoC-in-GitHub) appeared 6 months after disclosure.
- Disclosedday 0
- Public exploit codePoC-in-GitHub+6 mo
- First seen exploitedVulnCheck KEV evidence+10 mo
- Added to CISA KEVEU database agrees+10 mo
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
3 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 3Initial AccessTA0001
An attacker can exploit a deserialization/desanitization issue by injecting malicious JavaScript into a message. Parsing the HTML inside the message can allow the exfiltration of email data, as well as commandeer the victim's browser.
Credential AccessTA0006
CollectionTA0009
Detection
0 rules for this CVE · 10 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2024-42009 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Spearphishing LinkT1566.0024 general rules
- Potential Malicious Usage of CloudTrail System Managerhightest
- Suspicious Execution via macOS Script Editormediumtest
- Suspicious Email Delivered In Microsoft 365mediumexperimental
- EvilTokens PhaaS Kit Phishing Related Request - Proxylowexperimental
Input CaptureT10562 general rules
Email CollectionT11144 general rules
- Exchange PowerShell Snap-Ins Usagehightest
- Hacktool Rulerhightest
- PST Export Alert Using eDiscovery Alertmediumtest
- PST Export Alert Using New-ComplianceSearchActionmediumtest
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 30, 202629 Oct 2026
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- 44 more on OTX