CVE-2025-45091Network attack vector

Stored XSS via unescaped username rendering

Published Sep 15, 2025 · Updated Sep 15, 2025

Stored XSS in Seafile 11.0.18-Pro, 12.0.10, and 12.0.10-Pro allows remote authenticated users to run scripts in other users' browsers. Notification and activity views render an attacker-controlled username as executable page content rather than neutralizing it. An account that can change its username is required, and exploitation occurs when another user opens the affected content.

CVSS severity5.4
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Seafile 11.0.18-Pro, 12.0.10, and 12.0.10-Pro allows remote authenticated users to run scripts in other users' browsers. Notification and activity views render an attacker-controlled username as executable page content rather than neutralizing it. An account that can change its username is required, and exploitation occurs when another user opens the affected content.

The record

CVE
CVE-2025-45091
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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