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 — 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: 2%CVSS: 6.1Exploit: cisa kev · ssvc activeExposed: 0

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

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
9.0(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
2%
EPSS %ILE
76%
KEV
⚠ Exploited

Published

June 23, 2025

Last Modified

April 21, 2026

Advisory Details (4)

Auto-updated May 20, 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-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 56× in last 7d / 229× 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 577 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 in the National Vulnerability Database 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 patching attention.
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.
Which products are affected by CVE-2025-48700?
CVE-2025-48700 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-2025-48700?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-48700, 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-2025-48700

Explore →

Is Your Infrastructure Affected by CVE-2025-48700?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs