CVE-2026-13323Public exploitNetwork attack vector

Publisher account takeover via inline HTML rendering

Published Jul 1, 2026 · Updated Jul 1, 2026

Stored XSS in Eclipse Open VSX before 1.0.2 allows remote authenticated users to take over publisher accounts via crafted VSIX files. The /vscode/unpkg/ endpoint labels user-supplied HTML as text/html and serves it inline without CSP or attachment disposition. A publisher account and a click by an authenticated victim are required; same-origin script can steal the session, mint a PAT, and publish extension updates.

CVSS severity5.2
Medium
EPSS probability0.33%
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 Eclipse Open VSX before 1.0.2 allows remote authenticated users to take over publisher accounts via crafted VSIX files. The /vscode/unpkg/ endpoint labels user-supplied HTML as text/html and serves it inline without CSP or attachment disposition. A publisher account and a click by an authenticated victim are required; same-origin script can steal the session, mint a PAT, and publish extension updates.

The record

CVE
CVE-2026-13323
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Open VSX
Classifications
CWE-79, T1539, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 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=0.1.0 <1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Eclipse Foundation · Eclipse Open VSXversion=0.1.0 <1.0.2

Published CVSS scores

5.2Eclipse FoundationCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie
T1189Drive-by Compromise

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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