CVE-2025-63499Public exploitNetwork attack vector

Reflected XSS via unsanitized theme parameter

Published Dec 4, 2025 · Updated Dec 5, 2025

Reflected XSS in Alinto SOGo 5.12.4 and earlier allows remote attackers to execute scripts in a user’s browser via a crafted theme parameter. The relativePathToUserFolderSubPath method reads theme from the request and appends it to a generated Mail view URL without rejecting HTML injection. Exploitation requires the victim’s email address, a valid SOGo session, and interaction with the crafted URL, enabling script access to or modification of browser-session data.

CVSS severity6.1
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Alinto SOGo 5.12.4 and earlier allows remote attackers to execute scripts in a user’s browser via a crafted theme parameter. The relativePathToUserFolderSubPath method reads theme from the request and appends it to a generated Mail view URL without rejecting HTML injection. Exploitation requires the victim’s email address, a valid SOGo session, and interaction with the crafted URL, enabling script access to or modification of browser-session data.

The record

CVE
CVE-2025-63499
Published
Dec 4, 2025
Updated
Dec 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 5, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

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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