CVE-2023-43770

CRITICALNVD 6.19.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2024-02-12), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.1 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 64%CVSS: 6.1Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.1
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
64%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

September 22, 2023

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_commit, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43770
generic

Security update 1.6.3 released

https://roundcube.net/news/2023/09/15/security-update-1.6.3-released
generic Patch Available

[SECURITY] [DLA 3577-1] roundcube security update

https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html
github_commit

commit e92ec206a886 (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit e92ec206a886 — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubunturoundcube-sqlite3 (1.6.2+dfsg-1ubuntu0.1) @ mantic2026-09-25ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
roundcube1.3.10+dfsg.1-1 ... 1.3.8+dfsg.1-2 (10 versions)1.3.17+dfsg.1-1~deb10u3—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
roundcube1.4.11+dfsg.1-4 ... 1.4.14+dfsg.1-1~deb11u1~bpo10+1 (6 versions)1.4.14+dfsg.1-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
roundcube1.6.1+dfsg-1, 1.6.2+dfsg-11.6.3+dfsg-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
roundcube—1.6.3+dfsg-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
roundcube—1.6.3+dfsg-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 98× in last 7d / 388× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,450 total refreshes for this CVE.

  1. 2026-09-25 12:35 UTCVendor advisory
  2. 2026-09-25 12:35 UTCGHSA enrichment
  3. 2026-09-25 08:39 UTCVendor advisory
  4. 2026-09-25 08:39 UTCGHSA enrichment
  5. 2026-09-25 04:44 UTCVendor advisory
  6. 2026-09-25 04:43 UTCGHSA enrichment
  7. 2026-09-25 00:48 UTCVendor advisory
  8. 2026-09-25 00:48 UTCGHSA enrichment
  9. 2026-09-24 20:52 UTCVendor advisory
  10. 2026-09-24 20:52 UTCGHSA enrichment
  11. 2026-09-24 19:31 UTCCISA KEV update
  12. 2026-09-24 16:56 UTCEG score recompute
  13. 2026-09-24 16:56 UTCVendor advisory
  14. 2026-09-24 16:56 UTCGHSA enrichment
  15. 2026-09-24 14:01 UTCEPSS rescore
  16. 2026-09-24 14:01 UTCEPSS rescore
  17. 2026-09-24 13:00 UTCGHSA enrichment
  18. 2026-09-24 09:05 UTCVendor advisory
  19. 2026-09-24 09:05 UTCGHSA enrichment
  20. 2026-09-24 05:10 UTCVendor advisory
  21. 2026-09-24 05:09 UTCGHSA enrichment
  22. 2026-09-24 01:14 UTCVendor advisory
  23. 2026-09-24 01:14 UTCGHSA enrichment
  24. 2026-09-23 21:19 UTCVendor advisory
  25. 2026-09-23 21:19 UTCGHSA enrichment
Show 75 more
  1. 2026-09-23 17:23 UTCEG score recompute
  2. 2026-09-23 17:23 UTCVendor advisory
  3. 2026-09-23 17:23 UTCGHSA enrichment
  4. 2026-09-23 13:46 UTCEPSS rescore
  5. 2026-09-23 13:28 UTCVendor advisory
  6. 2026-09-23 13:28 UTCGHSA enrichment
  7. 2026-09-23 09:33 UTCVendor advisory
  8. 2026-09-23 09:33 UTCGHSA enrichment
  9. 2026-09-23 05:37 UTCVendor advisory
  10. 2026-09-23 05:37 UTCGHSA enrichment
  11. 2026-09-23 01:42 UTCVendor advisory
  12. 2026-09-23 01:42 UTCGHSA enrichment
  13. 2026-09-22 21:46 UTCVendor advisory
  14. 2026-09-22 21:46 UTCGHSA enrichment
  15. 2026-09-22 19:36 UTCCISA KEV update
  16. 2026-09-22 17:50 UTCEG score recompute
  17. 2026-09-22 17:50 UTCVendor advisory
  18. 2026-09-22 17:50 UTCGHSA enrichment
  19. 2026-09-22 13:54 UTCVendor advisory
  20. 2026-09-22 13:54 UTCGHSA enrichment
  21. 2026-09-22 09:58 UTCVendor advisory
  22. 2026-09-22 09:58 UTCGHSA enrichment
  23. 2026-09-22 06:02 UTCVendor advisory
  24. 2026-09-22 06:02 UTCGHSA enrichment
  25. 2026-09-22 02:07 UTCVendor advisory
  26. 2026-09-22 02:07 UTCGHSA enrichment
  27. 2026-09-21 22:11 UTCEG score recompute
  28. 2026-09-21 22:11 UTCVendor advisory
  29. 2026-09-21 22:11 UTCGHSA enrichment
  30. 2026-09-21 19:09 UTCCISA KEV update
  31. 2026-09-21 18:16 UTCVendor advisory
  32. 2026-09-21 18:16 UTCGHSA enrichment
  33. 2026-09-21 14:20 UTCVendor advisory
  34. 2026-09-21 14:20 UTCGHSA enrichment
  35. 2026-09-21 10:24 UTCVendor advisory
  36. 2026-09-21 10:24 UTCGHSA enrichment
  37. 2026-09-21 06:28 UTCVendor advisory
  38. 2026-09-21 06:28 UTCGHSA enrichment
  39. 2026-09-21 02:33 UTCVendor advisory
  40. 2026-09-21 02:33 UTCGHSA enrichment
  41. 2026-09-20 22:37 UTCVendor advisory
  42. 2026-09-20 22:37 UTCGHSA enrichment
  43. 2026-09-20 18:42 UTCVendor advisory
  44. 2026-09-20 18:42 UTCGHSA enrichment
  45. 2026-09-20 14:46 UTCVendor advisory
  46. 2026-09-20 14:46 UTCGHSA enrichment
  47. 2026-09-20 10:51 UTCVendor advisory
  48. 2026-09-20 10:51 UTCGHSA enrichment
  49. 2026-09-20 06:56 UTCVendor advisory
  50. 2026-09-20 06:55 UTCGHSA enrichment
  51. 2026-09-20 02:58 UTCVendor advisory
  52. 2026-09-20 02:58 UTCGHSA enrichment
  53. 2026-09-19 23:02 UTCVendor advisory
  54. 2026-09-19 23:02 UTCGHSA enrichment
  55. 2026-09-19 19:06 UTCEG score recompute
  56. 2026-09-19 19:06 UTCGHSA enrichment
  57. 2026-09-19 15:09 UTCVendor advisory
  58. 2026-09-19 15:09 UTCGHSA enrichment
  59. 2026-09-19 11:14 UTCVendor advisory
  60. 2026-09-19 11:14 UTCGHSA enrichment
  61. 2026-09-19 07:19 UTCVendor advisory
  62. 2026-09-19 07:18 UTCGHSA enrichment
  63. 2026-09-19 03:23 UTCVendor advisory
  64. 2026-09-19 03:23 UTCGHSA enrichment
  65. 2026-09-18 23:28 UTCVendor advisory
  66. 2026-09-18 23:28 UTCGHSA enrichment
  67. 2026-09-18 19:33 UTCEG score recompute
  68. 2026-09-18 19:33 UTCVendor advisory
  69. 2026-09-18 19:33 UTCGHSA enrichment
  70. 2026-09-18 19:25 UTCEPSS rescore
  71. 2026-09-18 19:20 UTCCISA KEV update
  72. 2026-09-18 15:36 UTCGHSA enrichment
  73. 2026-09-18 14:15 UTCCISA KEV update
  74. 2026-09-18 11:40 UTCVendor advisory
  75. 2026-09-18 11:40 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCknight0x07/CVE-2023-43770-PoC
    First seen Sep 28, 2023

    PoC for Stored XSS (CVE-2023-43770) Vulnerability

    Open source ↗
  • GitHub PoCs3cb0y/CVE-2023-43770-POC
    First seen Sep 27, 2023

    A Proof-Of-Concept for the CVE-2023-43770 vulnerability.

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(6)

What is CVE-2023-43770?
CVE-2023-43770 is a critical vulnerability published on September 22, 2023. 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/rcubestringreplacer.php behavior.
When was CVE-2023-43770 disclosed?
CVE-2023-43770 was first published in the National Vulnerability Database on September 22, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-43770 actively exploited?
Yes. CISA added CVE-2023-43770 to the Known Exploited Vulnerabilities catalog on February 12, 2024, affecting Roundcube Webmail. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-43770?
CVE-2023-43770 has a CVSS v3 base score of 6.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-43770?
CVE-2023-43770 affects Roundcube Webmail. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-43770?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-43770, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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