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CVE-2026-126813— Roundcube Webmail before 1.6.21 and 1.7.6 IMAP Command Injection via _uid

Quick assessment

Affected
Roundcube Webmail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Roundcube Webmail 1.6.21 之前版本以及 1.7.x 系列中 1.7.6 之前的版本存在 IMAP 命令注入漏洞。当启用了 功能时，攻击者可通过在 参数中注入 CRLF（回车换行）字符来注入恶意 IMAP 命令。攻击者可诱导已登录的受害者访问精心构造的指向 或 的 GET 链接，从而执行可删除邮件、修改邮件标志或通过 命令授予邮箱访问权限的 IMAP 指令。

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-126813

Vulnerability Information
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Vulnerability Title
Roundcube Webmail before 1.6.21 and 1.7.6 IMAP Command Injection via _uid
Source: CVE Program / CVE List V5
Vulnerability Description
Roundcube Webmail before 1.6.21 and 1.7.x before 1.7.6 contains an IMAP command injection vulnerability that allows attackers to inject commands via CRLF in the _uid parameter when messages_cache is enabled. Attackers can lure logged-in victims into opening crafted GET links to mail/show or mail/get, executing IMAP commands that delete messages, change flags, or grant mailbox access via SETACL.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Roundcube Webmail 0 ~ 1.6.21 -

II. Public POCs for CVE-2026-126813

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III. Intelligence Information for CVE-2026-126813

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Vendor Advisories for CVE-2026-126813 (1)

Other References for CVE-2026-126813 (7)

IV. Related Vulnerabilities

Same product: Webmail
Same vendor: Roundcube
Same weakness: CWE-93