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CVE-2023-43770 is a cross-site scripting vulnerability in Roundcube Webmail caused by improper handling of crafted links in text/plain email messages. The flaw affects Roundcube versions before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3. The vulnerable behavior is associated with Roundcube string replacement logic in rcube_string_replacer.php, which can allow attacker-controlled content embedded in an email message to be rendered in a way that executes malicious JavaScript in the context of the victim’s authenticated webmail session when the message is viewed. The issue has been used in webmail espionage campaigns as a zero-click or near-zero-click inbox-view attack vector against Roundcube users.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (POC) exploit for CVE-2023-43770, a stored cross-site scripting (XSS) vulnerability in Roundcube Webmail (versions before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3). The exploit consists of a single Python script (cve-2023-43770.py) that sends a specially crafted plain text email containing a malicious JavaScript payload to a target user. The script requires the attacker to provide sender email credentials and the recipient's email address, and it uses SMTP (defaulting to smtp.gmail.com:587) to deliver the payload. When the victim views the email in a vulnerable Roundcube instance, the JavaScript executes, demonstrating the XSS vulnerability. The repository also includes a README.md with usage instructions, references, and a disclaimer. No detection or scanning functionality is present; the code is strictly a POC for educational and testing purposes.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Roundcube vulnerability cited as one of the webmail flaws exploited by TA458 in Operation RoundPress.
Cross-site scripting vulnerability in Roundcube Webmail used by APT28 as an updated initial access vector via crafted links in text/plain email.
A Roundcube webmail persistent cross-site scripting vulnerability exploited by TA458 in webmail compromise campaigns.
A specific Roundcube vulnerability referenced as the key flaw to patch in connection with FancyBear's webmail exploitation campaign and XSS-based compromise activity.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.