CVE-2026-27458Public exploitNetwork attack vector

Stored XSS via Atom feed CDATA escape

Published Feb 21, 2026 · Updated Feb 21, 2026

Stored XSS in Kovah LinkAce 2.4.2 and earlier allows remote authenticated users to execute JavaScript through the lists Atom feed. The lists feed Blade template writes raw list descriptions inside CDATA, allowing an injected terminator to expose an SVG onload handler to the browser's XML parser. Any authenticated user who can create or edit an internal or public list can plant the payload, which executes in the LinkAce origin when the feed opens in a browser.

CVSS severity8.7
High
EPSS probability0.22%
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 Kovah LinkAce 2.4.2 and earlier allows remote authenticated users to execute JavaScript through the lists Atom feed. The lists feed Blade template writes raw list descriptions inside CDATA, allowing an injected terminator to expose an SVG onload handler to the browser's XML parser. Any authenticated user who can create or edit an internal or public list can plant the payload, which executes in the LinkAce origin when the feed opens in a browser.

The record

CVE
CVE-2026-27458
Published
Feb 21, 2026
Updated
Feb 21, 2026
Vendor
Kovah
Product
LinkAce
Classifications
CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 21, 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=< 2.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kovah · LinkAceversion=< 2.4.3

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA: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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007JavaScript/JScript

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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