CVE-2026-62644: CWE-290 Authentication Bypass by Spoofing in Roundcube Webmail
CVE-2026-62644 is an authentication bypass vulnerability in Roundcube Webmail affecting versions before 1.6.17 and 1.7.x before 1.7.2. The issue arises from username spoofing via session data in the password plugin, potentially allowing an attacker to take over user accounts. The vulnerability has a medium severity with a CVSS score of 6.4.
AI Analysis
Technical Summary
This vulnerability in Roundcube Webmail's password plugin allows an attacker to spoof usernames through manipulated session data, leading to authentication bypass. Specifically, versions prior to 1.6.17 and 1.7.2 are affected. Exploitation could result in account takeover due to improper validation of session information. The CVSS 3.1 vector indicates the attack requires network access, high attack complexity, low privileges, and user interaction, with high confidentiality and integrity impact but no availability impact.
Potential Impact
Successful exploitation can lead to account takeover by bypassing authentication controls through username spoofing in session data. This compromises confidentiality and integrity of user accounts but does not affect system availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
No official patch or remediation is currently confirmed. Users should monitor the Roundcube vendor advisories for updates. Until a fix is available, consider restricting access to trusted users and environments and review session management configurations to mitigate risk.
CVE-2026-62644: CWE-290 Authentication Bypass by Spoofing in Roundcube Webmail
Description
CVE-2026-62644 is an authentication bypass vulnerability in Roundcube Webmail affecting versions before 1.6.17 and 1.7.x before 1.7.2. The issue arises from username spoofing via session data in the password plugin, potentially allowing an attacker to take over user accounts. The vulnerability has a medium severity with a CVSS score of 6.4.
CVSS v3.1
Score 6.4medium
Affected software
pkg:github/roundcube/roundcubemailRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Roundcube Webmail's password plugin allows an attacker to spoof usernames through manipulated session data, leading to authentication bypass. Specifically, versions prior to 1.6.17 and 1.7.2 are affected. Exploitation could result in account takeover due to improper validation of session information. The CVSS 3.1 vector indicates the attack requires network access, high attack complexity, low privileges, and user interaction, with high confidentiality and integrity impact but no availability impact.
Potential Impact
Successful exploitation can lead to account takeover by bypassing authentication controls through username spoofing in session data. This compromises confidentiality and integrity of user accounts but does not affect system availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
No official patch or remediation is currently confirmed. Users should monitor the Roundcube vendor advisories for updates. Until a fix is available, consider restricting access to trusted users and environments and review session management configurations to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-14T15:55:22.524Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a56617068715ace43d27068
Added to database: 07/14/2026, 16:18:56 UTC
Last enriched: 07/21/2026, 19:40:34 UTC
Last updated: 08/26/2026, 22:52:12 UTC
Views: 201
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