CVE-2025-48700

Published Jun 23, 2025

Last updated 10 days ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-48700 describes a Cross-Site Scripting (XSS) vulnerability found in Zimbra Collaboration Suite (ZCS) versions 8.8.15, 9.0, 10.0, and 10.1. This flaw specifically impacts the Zimbra Classic UI, enabling attackers to execute arbitrary JavaScript within a user's session. The root cause lies in inadequate sanitization of HTML content, particularly concerning crafted tag structures and attribute values that incorporate an `@import` directive and other script injection methods. The vulnerability can be triggered without any additional user interaction beyond viewing a specially crafted email message within the Classic UI. Successful exploitation of CVE-2025-48700 could lead to unauthorized access to sensitive information. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has included this vulnerability in its Known Exploited Vulnerabilities (KEV) catalog, indicating that it has been actively exploited in real-world attacks since at least September 2025.

Description
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.
Source
cve@mitre.org
NVD status
Analyzed
Products
zimbra_collaboration_suite

Risk scores

CVSS 3.1

Type
Secondary
Base score
6.1
Impact score
2.7
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Severity
MEDIUM

Weaknesses

134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE-79

Social media

Hype score
Not currently trending
  1. ⚠️ Vulnerabilidad en productos Zimbra ❗ CVE-2025-48700 ➡️ Más info: https://t.co/k4NW6wV88I https://t.co/rM4LjwrFys

    @CERTpy

    29 Apr 2026

    195 Impressions

    0 Retweets

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  2. csirt_it: La Settimana Cibernetica del 26 aprile 2026 🔹aggiornamenti per molteplici prodotti 🔹Zimbra: rilevato sfruttamento in rete della CVE-2025-48700 🔹Libreria protobufjs: disponibile PoC per lo sfruttamento della CVE 2026-41242 ⚠️#EPSS 🔗 … https://t.co/oZ

    @Vulcanux_

    27 Apr 2026

    274 Impressions

    0 Retweets

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  3. La Settimana Cibernetica del 26 aprile 2026 🔹aggiornamenti per molteplici prodotti 🔹Zimbra: rilevato sfruttamento in rete della CVE-2025-48700 🔹Libreria protobufjs: disponibile PoC per lo sfruttamento della CVE 2026-41242 ⚠️#EPSS 🔗 https://t.co/L2uywEEoOX https

    @csirt_it

    27 Apr 2026

    395 Impressions

    1 Retweet

    1 Like

    0 Bookmarks

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  4. *Over 10,000 internet-exposed Zimbra servers remain vulnerable while exploitation continues* Why it matters: with CVE-2025-48700 now in KEV, unpatched mail/collaboration servers remain a high-probability initial access path. Source: https://t.co/1ZznpcRnTV

    @gbc13

    25 Apr 2026

    147 Impressions

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  5. CISA added CVE-2025-48700 to KEV: XSS in Zimbra Collaboration Suite. Attacker plants JS that runs in your webmail session — read mail, steal tokens, act as you. Zimbra XSS bugs were exploited for espionage in 2023. Patch. https://t.co/RcMgz6Pr6v

    @TechTranslators

    25 Apr 2026

    1 Impression

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  6. Top 5 Trending CVEs: 1 - CVE-2024-7399 2 - CVE-2023-50224 3 - CVE-2025-48700 4 - CVE-2025-20333 5 - CVE-2026-5281 #cve #cvetrends #cveshield #cybersecurity https://t.co/4Fua3CAN6W

    @CVEShield

    25 Apr 2026

    226 Impressions

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  7. TRC analysis shows attackers exploited CVE-2025-48700 XSS vulnerability in 10,000+ unpatched Zimbra servers through crafted emails. Post-compromise lateral movement allowed network-wide pivoting. Runtime segmentation helps contain such breach chains after initial email system

    @aviatrixtrc

    25 Apr 2026

    151 Impressions

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  8. بیش از ۱۰,۵۰۰ نمونه از نرم‌افزار همکاری زیمبرا (Zimbra Collaboration Suite) که در اینترنت در معرض دسترسی عموم قرار دارند، در برابر حملاتی که از یک آسیب‌پذیری اسکریپت

    @Teeegra

    24 Apr 2026

    797 Impressions

    0 Retweets

    11 Likes

    1 Bookmark

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  9. Over 10,500 Zimbra servers remain vulnerable to CVE-2025-48700, an XSS flaw exploited by APT28 and APT29 in targeted phishing and mass intrusions. CISA lists it in KEV for federal patching. #ZimbraServer #CrossSiteScripting #USA https://t.co/YKXgjSu0kG

    @TweetThreatNews

    24 Apr 2026

    204 Impressions

    0 Retweets

    2 Likes

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    1 Reply

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  10. 🔥 𝐎𝐯𝐞𝐫 𝟏𝟎,𝟎𝟎𝟎 𝐙𝐢𝐦𝐛𝐫𝐚 𝐬𝐞𝐫𝐯𝐞𝐫𝐬 𝐯𝐮𝐥𝐧𝐞𝐫𝐚𝐛𝐥𝐞 𝐭𝐨 𝐨𝐧𝐠𝐨𝐢𝐧𝐠 𝐗𝐒𝐒 𝐚𝐭𝐭𝐚𝐜𝐤𝐬 • Over 10,000 Zimbra Collaboration Suite (ZCS) instances

    @PurpleOps_io

    24 Apr 2026

    137 Impressions

    0 Retweets

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  11. 🚨 10,000+ Zimbra Servers Exposed to Active XSS Attacks → Attack: Unpatched XSS flaw (CVE-2025-48700) triggered via malicious email, no user interaction needed → Impact: Session hijacking + sensitive data theft across gov & enterprise email systems 💡 Insight: Old p

    @VivekIntel

    24 Apr 2026

    266 Impressions

    0 Retweets

    1 Like

    1 Bookmark

    1 Reply

    0 Quotes

  12. 🚨 Over 10,000 Zimbra Servers Exposed to Active XSS Exploits as #CVE-2025-48700 Attacks Spread Globally -Fact Checker: ✅: 4 ❌: 0 || 4/4 https://t.co/N84rhWVZFO

    @UndercodeNews

    24 Apr 2026

    131 Impressions

    0 Retweets

    0 Likes

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    0 Replies

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  13. We are scanning/reporting daily Zimbra Collaboration Suite instances vulnerable to CVE-2025-48700, that can allow unauthorized access to sensitive information. This vulnerability is exploited in the wild and on @CISACyber KEV. We see over 10.5K IPs unpatched 2026-04-23. https://t

    @Shadowserver

    24 Apr 2026

    1013 Impressions

    5 Retweets

    6 Likes

    1 Bookmark

    1 Reply

    0 Quotes

  14. ⚠️Alerte critique sur Zimbra : CVE-2025-48700 activement exploitée (zoneantimalware..com) https://t.co/cQ9nI8sm2f

    @NicolasCoolman

    23 Apr 2026

    152 Impressions

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  15. 🛡️ Vulnerabilidad XSS en Zimbra: CVE-2025-48700 Análisis y Mitigaciones Descubre el análisis técnico de la vulnerabilidad CVE-2025-48700 en Synacor Zimbra Collaboration Suite, un XSS que permite ejecución de JavaScript. Impacto, rec https://t.co/cuCMM5VnJe #ciberplaneta

    @CiberPlanetaOrg

    22 Apr 2026

    127 Impressions

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  16. 🛡️ Alerta de Seguridad: Vulnerabilidad de Cross-Site Scripting en Synacor Zimbra Collaboration Suite (ZCS) (CVE-2025-48700) Synacor Zimbra Collaboration Suite (ZCS) contiene una vulnerabilidad de cross-site scripting (XSS, CWE-79) que permite a atacantes ejecutar JavaScript

    @CiberPlanetaOrg

    22 Apr 2026

    123 Impressions

    0 Retweets

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  17. csirt_it: ‼️ #Exploited: rilevato lo sfruttamento attivo in rete della vulnerabilità CVE-2025-48700, che interessa #ZimbraCollaborationSuite #ZCS Rischio: 🟠 Tipologia: 🔸 Information Disclosure 🔗 https://t.co/yAMJ46EFLq ⚠️ Importante mantenere aggi… https:/

    @Vulcanux_

    22 Apr 2026

    111 Impressions

    0 Retweets

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  18. ‼️ #Exploited: rilevato lo sfruttamento attivo in rete della vulnerabilità CVE-2025-48700, che interessa #ZimbraCollaborationSuite #ZCS Rischio: 🟠 Tipologia: 🔸 Information Disclosure 🔗 https://t.co/EYvtMqExzs ⚠️ Importante mantenere aggiornati i sistemi ⚠

    @csirt_it

    22 Apr 2026

    301 Impressions

    1 Retweet

    4 Likes

    1 Bookmark

    0 Replies

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  19. Warning: Cross-site scripting vulnerability in #Zimbra Collaboration Suite. #CVE-2025-48700 CVSS: 6.1. This vulnerability is #actively exploited to access unauthorised information. #Patch #Patch #Patch

    @CCBalert

    21 Apr 2026

    180 Impressions

    1 Retweet

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  20. 🚨 [HIGH] Active exploitation detected: CVE-2025-48700 Exploit in the wild confirmed for CVE-2025-48700 (CVSS null). Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability t... 🔗 https://t.co/RZBhpWnHFz #ZeroDay #ExploitInWild #CyberSecurity

    @ctiwatchcloud

    21 Apr 2026

    165 Impressions

    0 Retweets

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  21. Latest Known Exploited Vulnerabilities (#KEV) : #CVE-2025-48700 #Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability https://t.co/isipTlWcPQ

    @ScyScan

    21 Apr 2026

    142 Impressions

    0 Retweets

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  22. CISA just added 8 vulnerabilities to Known Exploited Catalog. Active exploitation confirmed. CVE-2025-48700 (Zimbra XSS), CVE-2025-32975 (Quest KACE), CVE-2024-27199 (JetBrains TeamCity). If you're running these, you're already compromised. #Cybersecurity #CISA

    @battista212

    20 Apr 2026

    185 Impressions

    0 Retweets

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    1 Reply

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  23. CVE-2025-48700 Stored XSS in Zimbra Collaboration Classic UI Enables Arbitrary JavaScript Execution https://t.co/bJkIkZSam2

    @VulmonFeeds

    23 Jun 2025

    43 Impressions

    0 Retweets

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