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ExploitedIn CISA KEVFix available

CVE-2020-35730

Exploitation confirmed. First attested on 2023-06-22 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-12-28
  • Fixed in1.4.10 · 1.3.16 · 1.2.13
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-12-2820:15CVE publishedNVD
  2. 2023-06-22Added to the CISA KEV catalogCISA KEV
  3. 2023-06-22Listed as exploited by GCVEGCVE
  4. 2023-06-22Exploitation first reportedCISA KEV
  5. 2025-02-0420:21SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-02 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-35730?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-35730?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Roundcube webmail
BranchAffectedFixed in
1.4≥ 1.4, < 1.4.101.4.10
1.4≥ 1.4.0, < 1.4.101.4.10
1.3≥ 1.3.0, < 1.3.161.3.16
1.2< 1.2.131.2.13
Fedoraproject fedora
BranchAffectedFixed in
32.x= 32no fix published
33.x= 33no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • roundcubeUbuntu:Pro:22.04:LTSall versions · fixed in 1.5.0+dfsg.1-2ubuntu0.1~esm1
  • roundcubeUbuntu:Pro:20.04:LTSall versions · fixed in 1.4.3+dfsg.1-1ubuntu0.1~esm2
  • roundcubeUbuntu:Pro:18.04:LTSall versions · fixed in 1.3.6+dfsg.1-1ubuntu0.1~esm2
  • roundcubeUbuntu:Pro:16.04:LTSall versions · fixed in 1.2~beta+dfsg.1-0ubuntu1+esm2
  • roundcubeDebian:14all versions · fixed in 1.4.10+dfsg.1-1
  • roundcubeDebian:13all versions · fixed in 1.4.10+dfsg.1-1
  • roundcubeDebian:12all versions · fixed in 1.4.10+dfsg.1-1
  • roundcubeDebian:10all versions · fixed in 1.3.16+dfsg.1-1~deb10u1

13 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-35730 Red Hat Product Security

    roundcubemail: XSS via HTML or plain text messages with malicious content

Full record on NVD

Fix

  1. Update Roundcube webmail to 1.4.10 · 1.3.16 · 1.2.13
  2. CISA’s required action: Apply updates per vendor instructions.due 2023-07-13

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedskyllpro/CVE-2021-44026-PoC
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2023-06-22
Patch Due Date
2023-07-13
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2020-12-28
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-mr5j-h8xf-5m2m

Frequently asked questions

What is CVE-2020-35730?

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.

Is CVE-2020-35730 actively exploited?

Yes. CVE-2020-35730 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-07-13.

What is the CVSS score for CVE-2020-35730?

CVE-2020-35730 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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Sources for this record