Home/CVE/Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
CVE

CVE-2020-35730

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

MEDIUM · CVSS 6.1 ⚠ CISA KEV EPSS 0.67424
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 1% of all CVEs by exploitation likelihood
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

1
actorWinter Vivern / TA473 (TAG-70)
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

5
roundcube webmail< 1.2.13
roundcube webmail>= 1.3.0 and < 1.3.16
roundcube webmail>= 1.4 and < 1.4.10
fedoraproject fedoraall versions
debian linuxall versions
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalRenamed Whoami Execution
▣

Scoring & Timeline

6.1
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Dec 2020 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

10
suse-csafopenSUSE-SU-2024:11303-1
cisaKEV-CVE-2020-35730
suse-csafopenSUSE-SU-2022:10148-1
usnUSN-5182-1
suse-csafopenSUSE-SU-2021:1014-1
🔗

References & Sources

10
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491Issue TrackingMailing List
https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10Patch
https://github.com/roundcube/roundcubemail/releases/tag/1.2.13Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.3.16Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.4.10Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/Mailing ListRelease Notes
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