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ExploitedIn CISA KEVFix available

CVE-2023-43770

Exploitation confirmed. First attested on 2024-02-12 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2023-09-22
  • Fixed in1.6.3 · 1.5.4 · 1.4.14
  • 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

Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

Timeline

dates in UTC
  1. 2023-09-2206:15CVE publishedNVD
  2. 2024-02-12Added to the CISA KEV catalogCISA KEV
  3. 2024-02-12Listed as exploited by GCVEGCVE
  4. 2024-02-12Exploitation first reportedCISA KEV
  5. 2024-05-0118:43SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 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-2023-43770?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-43770?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · CISA-ADP · OSV
Roundcube webmail
BranchAffectedFixed in
1.6≥ 1.6.0, < 1.6.31.6.3
1.5≥ 1.5.0, < 1.5.41.5.4
1.4< 1.4.141.4.14
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
10.x= 10no 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~esm2
  • roundcubeUbuntu:Pro:20.04:LTSall versions · fixed in 1.4.3+dfsg.1-1ubuntu0.1~esm3
  • roundcubeUbuntu:Pro:18.04:LTSall versions · fixed in 1.3.6+dfsg.1-1ubuntu0.1~esm3
  • roundcubeUbuntu:Pro:16.04:LTSall versions · fixed in 1.2~beta+dfsg.1-0ubuntu1+esm3
  • roundcubeDebian:14all versions · fixed in 1.6.3+dfsg-1
  • roundcubeDebian:13all versions · fixed in 1.6.3+dfsg-1
  • roundcubeDebian:12all versions · fixed in 1.6.3+dfsg-1~deb12u1
  • roundcubeDebian:10all versions · fixed in 1.3.17+dfsg.1-1~deb10u3

Full record on NVD

Fix

  1. Update Roundcube webmail to 1.6.3 · 1.5.4 · 1.4.14
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2024-03-04

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifieds3cb0y/CVE-2023-43770-POCknight0x07/CVE-2023-43770-PoCskyllpro/CVE-2021-44026-PoC
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-02-12
Patch Due Date
2024-03-04
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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
2023-09-22
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-g3fv-4f2h-xwv4

Frequently asked questions

What is CVE-2023-43770?

Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

Is CVE-2023-43770 actively exploited?

Yes. CVE-2023-43770 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 2024-03-04.

What is the CVSS score for CVE-2023-43770?

CVE-2023-43770 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