medium Known exploitedREV. 01
CVE-2020-35730Roundcube — a link reference in plain text mail
Roundcube mishandles a link reference inside a plain text message, so script the sender embedded runs in the reader's session — cross-site scripting (XSS). Fixed in 1.2.13, 1.3.16 and 1.4.10.
Read the risk
THE VITAL STATS- CVSS score
- 6.1/ 10 CVSS v3.1
- EPSS probability
- 33% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2020-12-28
- Added to KEV
- 2023-06-22
- Exploit published
- Not recorded
- Confidence
- high
- Kill chain
- execution
- MITRE ATT&CK
- T1059.007
- Severity
- medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attacker needsThe victim must open the message.
Fixed inRoundcube Webmail >= 1.2.13, Roundcube Webmail >= 1.3.16, Roundcube Webmail >= 1.4.10
Behind the card
3 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorygithub.comgithub.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.