CVE-2025-27380Network attack vector

Session theft via crafted Project Release HTML

Published Jan 22, 2026 · Updated Jan 22, 2026

Stored XSS in Project Release in Altium On-Prem Enterprise Server 7.0.3 through 7.0.5 allows remote authenticated users to steal session IDs. Project Release accepts crafted HTML content and renders it without neutralizing executable JavaScript in another user's browser. A victim must view the malicious project release; the script then runs in that browser context and can disclose the victim's session ID.

CVSS severity7.6
High
EPSS probability0.25%
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 Project Release in Altium On-Prem Enterprise Server 7.0.3 through 7.0.5 allows remote authenticated users to steal session IDs. Project Release accepts crafted HTML content and renders it without neutralizing executable JavaScript in another user's browser. A victim must view the malicious project release; the script then runs in that browser context and can disclose the victim's session ID.

The record

CVE
CVE-2025-27380
Published
Jan 22, 2026
Updated
Jan 22, 2026
Vendor
Altium
Product
Altium On-Prem Enterprise Server
Classifications
CWE-79, CAPEC-63, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.3 <=7.0.5 changes=[{"at":"7.0.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Altium · Altium On-Prem Enterprise Serverversion=7.0.3 <=7.0.5 changes=[{"at":"7.0.6","status":"unaffected"}]

Published CVSS scores

7.6AltiumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63Cross-Site Scripting
T1539Steal Web Session Cookie

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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