CVE-2023-37580

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 2023-07-27), 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 — 4 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: 47%CVSS: 6.1Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.

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
47%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

July 31, 2023

Last Modified

October 31, 2025

Advisory Details (4)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: 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-2023-37580
generic

Zimbra Responsible Disclosure Policy - Zimbra :: Tech Center

https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
generic🔴 Active Exploitation

Security Center - Zimbra :: Tech Center

https://wiki.zimbra.com/wiki/Security_Center
generic🔴 Active Exploitation

oss-security - CVE-2023-37580 (and others): XSS vulnerabilities in Zimbra Collaboration Suite

http://www.openwall.com/lists/oss-security/2023/11/17/2

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 238× 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 560 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Nucleihttp/cves/2023/CVE-2023-37580.yaml
    First seen Jan 1, 2023

    Zimbra Collaboration Suite (ZCS) v.8.8.15 - Cross-Site Scripting

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2023-37580?
CVE-2023-37580 is a critical vulnerability published on July 31, 2023. Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.
When was CVE-2023-37580 disclosed?
CVE-2023-37580 was first published in the National Vulnerability Database on July 31, 2023, with the most recent update on October 31, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-37580 actively exploited?
Yes. CISA added CVE-2023-37580 to the Known Exploited Vulnerabilities catalog on July 27, 2023, affecting Synacor Zimbra Collaboration Suite (ZCS). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-37580?
CVE-2023-37580 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-2023-37580?
CVE-2023-37580 affects Synacor Zimbra Collaboration Suite (ZCS). 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-2023-37580?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-37580, 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

Explore the affected products and dependency analysis for CVE-2023-37580

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