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9.8
CVE-2026-113386EXPLOITEDPATCHED
roundcube · roundcube webmail

CVE-2026-113386: Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 are affected by IMAP command injection. A remote authenticated at

Description

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 are affected by IMAP command injection. A remote authenticated attacker can exploit this via CRLF sequences injected into the _uid parameter of the mail/headers and mail/viewsource actions to execute arbitrary IMAP commands.

Affected Products

VendorProductVersions
roundcuberoundcube webmail1.6.0, 1.7.0, < 1.5.15, < 1.6.15, < 1.7-rc6, < 1.6.16, < 1.7.1, < 1.6.20, 1.7.0 - 1.7.4

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
open sourceroundcubecert_advisory90%

References

  • https://bugs.debian.org/1151279(issue-tracking, third-party-advisory)
  • https://github.com/roundcube/roundcubemail/commit/004adaaeca4f6799715a54d12e3f657f19efcc9a(patch)
  • https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5(vendor-advisory, release-notes)
  • https://github.com/roundcube/roundcubemail/releases/tag/1.7.5(release-notes, patch)
  • https://github.com/roundcube/roundcubemail/releases/tag/1.6.20(release-notes, patch)
  • https://github.com/roundcube/roundcubemail/commit/f62879defc0330ae240c72b83b2d00a8ab337447(patch)
  • https://github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b640409e64a6c6c2705049(patch)

Related News (4 articles)

Tier C
oss-security14h ago
Roundcube webmail: multiple vulnerabilities prior to 1.6.20 / 1.7.5
→ No new info (linked only)
Tier B
BSI Advisories19h ago
[NEU] [hoch] Roundcube Webmail: Mehrere Schwachstellen
→ No new info (linked only)
Tier C
VulDB1d ago
CVE-2026-113386 | Roundcube Webmail up to 1.6.19/1.7.4 _uid command injection
→ No new info (linked only)
Tier B
CERT-FR2d ago
Multiples vulnérabilités dans Roundcube Webmail (19 octobre 2026)
→ No new info (linked only)

Discussion (0)

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CVSS 3.19.8 CRITICAL
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
CISA KEV❌ No
Actively exploited✅ Yes
Patch available
1.6.201.7.5
CWECWE-93, CWE-94, CWE-20, CWE-352, CWE-89, CWE-113, CWE-79, CWE-918, CWE-502, CWE-434
PublishedOct 20, 2026
Last enriched1d agov2
Tags
security policy bypasswebmailroundcubesecurity advisoryupdatercessrfxsscsrfsecurity-bypassimap-injectionheader-injectionobject-injectionimagemagicksquirrelmail
Trending Score81
Source articles12
Independent12
Info Completeness9/14
Missing: epss, kev, exploit, iocs, mitre_attack

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Related CVEs (5)

PRE-CVE
Multiple vulnerabilities in Roundcube Webmail
Trending: 22
MEDIUMCVE-2026-75000
CVE-2026-75000: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, improper HTML/CSS sanitization of the SVG animate "by" attrib
MEDIUMCVE-2026-75003
CVE-2026-75003: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, an unclosed url() in a FuncIRI attribute of an SVG image coul
MEDIUMCVE-2026-75010
In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the modoboa driver of the password plugin could leak a Modoboa API authentication token to a user-controlled host via crafted session data. T
HIGHCVE-2026-75002
CVE-2026-75002: In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, mail search and LITERAL+ byte-count desynchronization could l

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
Oct 20, 2026
Actively Exploited
Oct 20, 2026
Exploit Available
Oct 20, 2026
Patch Available
Oct 20, 2026
Discovered by ZDM
Oct 20, 2026
Updated: severity, cvssEstimate
Oct 20, 2026

Version History

v2
Last enriched 1d ago
v2Tier C1d ago

Severity updated from HIGH to CRITICAL based on new classification; CVSS estimate adjusted from 7.1 to 9.8 to reflect critical severity rating

severitycvssEstimate
via VulDB
v11d ago

Initial creation