CVE-2025-48700
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An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1
rank 58 = 40 + 0 + 5 + 5 + 8
rank@v1 · this cycle
Someone is already using it
CISA KEV catalog · public proof-of-concept · FIRST EPSS
EPSS 0.01690 · CISA KEV listed · without this subject the record ranks 18
What it costs you if it fires
NVD CVSS base score, then the CNA's own
no CVSS held by anyone · without this subject the record ranks 58
It is getting worse, not staying still
FIRST EPSS series, rescorings and bad loads removed
rose on 2026-04-21 · without this subject the record ranks 53
How much of the world it touches
NVD CPE configurations
4 products in the CPE ranges · without this subject the record ranks 53
Someone else already set the date
CISA KEV remediation due date
CISA remediation date held · without this subject the record ranks 50
Hindsight · the state
Foresight · where to check next
This record is one instance of CWE-79, improper neutralization of input during web page generation ('cross-site scripting'). The index holds 47893 prior instances of this class, 31 KEV-listed. The nearest of its KEV-listed records are drawn beside this. taxonomy@v1
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Harm, if it fires from the vector and the weakness
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CISA KEV & Federal Remediation Deadline from the record and CISA
The fix, and how long it's been waiting.
Exploit Status & Known PoCs a ladder, not a score
Current rung: Exploited in the wild · CISA KEV listed, 2026-04-20.
- RUNG 1Nothing observed in held sources
- RUNG 2Proof-of-concept published
- RUNG 3Exploited in the wild · CISA KEV listed2026-04-20receipt
- RUNG 4Ransomware campaign use known
Affected & Fixed Versions as published
A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.
What it is stated by the CNA
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. receipt
NVD's analysis a second authority
- weakness
- CWE-79
- affected versions
- synacor zimbra collaboration suite >= 10.0.0 < 10.0.12; synacor zimbra collaboration suite >= 10.1.0 < 10.1.4; synacor zimbra collaboration suite 8.8.15; and 1 more, listed in full below
- also scored by
- 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
check it yourself wiki.zimbra.com wiki.zimbra.com wiki.zimbra.com receipt
Dated events
Movement the material steps
This score more than doubled inside 72 hours. Both observations are in the full history below.
Show all 31 observations
31 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt
The full biography
Listed by CISA 301 days after it published, exploit probability more than doubled between 2026-04-19 and 2026-04-21 (0.00181 → 0.34511) and the record had been public for 1 year, 2 months when this index was last written.
The pattern, elsewhere
This record is one instance of CWE-79, improper neutralization of input during web page generation ('cross-site scripting'). The index holds 47893 prior instances of this class, 31 KEV-listed. The nearest of its KEV-listed records are drawn beside this. [email protected]
"Matches n of m" counts the attributes the two records can both be compared on: the CVSS metrics they share a version of, any weakness class beyond this one, and the vendor. fit-rules@v1
47893 records in this class held. The six above are drawn from the ones CISA has listed as exploited, ranked by how much of the record matches this one. That is why every one of them is KEV-listed: the pool is, so the colour on those spokes says nothing the pool has not already said.
No curated product neighbourhood is held for this product, so the records above are the nearest this index can name. The neighbourhood table covers a small set of products and is extended by hand.
Siblings and hubs
Records related to this one
No record cites this identifier and it carries no alias. The advisory that covers it is below.
Fixed with these, by one advisory
advisory published by wiki.zimbra.com
Of the 10 records in this advisory, this is the only one holding a CISA KEV listing: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scriptin.
Listed because one advisory covers them, not because they are the same defect. Each record's own state is on its own page.
Grouping: held values
Browse the index from here
These are index-wide views, not findings about CVE-2025-48700.
What usually comes next
Everything above needs no account. What is below is work: assembling it, scoping it to your estate, watching it, and handing it to someone else.