CVE-2025-48700

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 2026-04-20), 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 — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1.7%CVSS: 6.1Exploit: cisa kev · ssvc activeExposed services: Not assessed

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

An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1. A Cross-Site Scripting (XSS) vulnerability in the Zimbra Classic UI allows attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information. This issue arises from insufficient sanitization of HTML content, specifically involving crafted tag structures and attribute values that include an @import directive and other script injection vectors. The vulnerability is triggered when a user views a crafted e-mail message in the Classic UI, requiring no additional user interaction.

CVSS v3
6.1
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
1.7%
EPSS %ILE
76th
KEV
⚠ Exploited

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 23, 2025

Last Modified

April 21, 2026

Advisory Details (4)

Auto-updated May 20, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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-2025-48700
generic

Zimbra Security Advisories - Zimbra :: Tech Center

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 53× in last 7d / 242× 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 1,078 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2025-48700?
CVE-2025-48700 is a critical vulnerability published on June 23, 2025. An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1. A Cross-Site Scripting (XSS) vulnerability in the Zimbra Classic UI allows attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive…
When was CVE-2025-48700 disclosed?
CVE-2025-48700 was first published on June 23, 2025, with the most recent update on April 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-48700 actively exploited?
Yes. CISA added CVE-2025-48700 to the Known Exploited Vulnerabilities catalog on April 20, 2026, affecting Synacor Zimbra Collaboration Suite (ZCS). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
What is the CVSS score of CVE-2025-48700?
CVE-2025-48700 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 (CRITICAL).
Which products are affected by CVE-2025-48700?
CVE-2025-48700 affects Synacor Zimbra Collaboration Suite (ZCS).
How do I remediate CVE-2025-48700?
No fix for CVE-2025-48700 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

Dependency Blast Radius

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