CVE-2020-35730 (GCVE-0-2020-35730)
Vulnerability from cvelistv5 – Published: 2020-12-28 19:37 – Updated: 2025-10-21 23:35Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: active
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 20:21 UTC
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://roundcube.net/download/ | x_refsource_MISC |
| https://github.com/roundcube/roundcubemail/compar… | x_refsource_CONFIRM |
| https://bugs.debian.org/cgi-bin/bugreport.cgi?bug… | x_refsource_CONFIRM |
| https://www.alexbirnberg.com/roundcube-xss.html | x_refsource_MISC |
| https://github.com/roundcube/roundcubemail/releas… | x_refsource_CONFIRM |
| https://github.com/roundcube/roundcubemail/releas… | x_refsource_CONFIRM |
| https://github.com/roundcube/roundcubemail/releas… | x_refsource_CONFIRM |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 505403c7-9a75-4481-8548-63e87ce3d240
Exploited: Yes
Timestamps
First Seen: 2023-06-22
Asserted: 2023-06-22
Scope
Notes: KEV entry: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability | Affected: Roundcube / Roundcube Webmail | Description: Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows an attacker to send a plain text e-mail message with Javascript in a link reference element that is mishandled by linkref_addinindex in rcube_string_replacer.php. | Required action: Apply updates per vendor instructions. | Due date: 2023-07-13 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://roundcube.net/news/2020/12/27/security-updates-1.4.10-1.3.16-and-1.2.13; https://nvd.nist.gov/vuln/detail/CVE-2020-35730
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-79 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Roundcube Webmail |
| Due Date | 2023-07-13 |
| Date Added | 2023-06-22 |
| Vendorproject | Roundcube |
| Vulnerabilityname | Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:26 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c8884f32-f5a9-4f6f-a487-5eb959231ff1
Exploited: Yes
Timestamps
First Seen: 2023-06-22
Asserted: 2023-06-22
Scope
Notes: KEVIntel entry: 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... | Affected: Roundcube / Webmail | CVSS: 6.1 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | 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... |
| Vendor | Roundcube |
| Product | Webmail |
| Added Date | 2023-06-22T00:00:00.000Z |
| Cvss Score | 6.1 |
| Epss Score | None |
| Cvss Severity | MEDIUM |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:05 UTC
| Updated: 2026-07-10 06:14 UTC
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"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.4.10"
},
{
"name": "https://github.com/roundcube/roundcubemail/releases/tag/1.3.16",
"refsource": "CONFIRM",
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.3.16"
},
{
"name": "https://github.com/roundcube/roundcubemail/releases/tag/1.2.13",
"refsource": "CONFIRM",
"url": "https://github.com/roundcube/roundcubemail/releases/tag/1.2.13"
},
{
"name": "FEDORA-2021-2cb0643316",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/"
},
{
"name": "FEDORA-2021-73359af51c",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2020-35730",
"datePublished": "2020-12-28T19:37:08.000Z",
"dateReserved": "2020-12-27T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:35:31.104Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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