CVE-2021-44026: Roundcube Webmail SQL Injection Vulnerability

How to check if you are exposed to CVE-2021-44026

1. Find every Roundcube Webmail system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2021-44026.

US federal agencies had to fix this by 2023-07-13. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2021-44026. Check the vendor advisory for the exact fixed builds before you sign anything off.

Timeline

1. 2021-11-19 · Published in the National Vulnerability Database
2. 2023-06-22 · Added to CISA's Known Exploited Vulnerabilities catalog, 580 days after it was published
3. 2023-07-13 · Fix-by date for US federal agencies, passed 1,207 days ago

Vendor advisories and fixes

• https://roundcube.net/news/2021/11/12/security-updates-1.4.12-and-1.3.17-released

Weakness type

• CWE-89

More exploited Roundcube vulnerabilities

CISA lists 11 exploited Roundcube vulnerabilities. The closest matches:

• CVE-2020-35730Roundcube Webmail Cross-Site Scripting (XSS) VulnerabilityAdded 2023-06-22
• CVE-2020-12641Roundcube Webmail Remote Code Execution VulnerabilityAdded 2023-06-22
• CVE-2017-16651Roundcube Webmail File Disclosure VulnerabilityAdded 2021-11-03
• CVE-2025-68461RoundCube Webmail Cross-site Scripting VulnerabilityAdded 2026-02-20
• CVE-2025-49113RoundCube Webmail Deserialization of Untrusted Data VulnerabilityAdded 2026-02-20
• CVE-2024-42009RoundCube Webmail Cross-Site Scripting VulnerabilityAdded 2025-06-09
• CVE-2024-37383RoundCube Webmail Cross-Site Scripting (XSS) VulnerabilityAdded 2024-10-24
• CVE-2020-13965Roundcube Webmail Cross-Site Scripting (XSS) VulnerabilityAdded 2024-06-26

Keep going

• All exploited CVEs
• Check another CVE
• What is CISA KEV?
• What is EPSS?

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.