CVE-2026-49436Public exploitNetwork attack vectorHinoki check available

Session hijacking via stored javascript URI

Published Aug 20, 2026 · Updated Aug 20, 2026

Stored XSS in Kovah LinkAce before 2.5.7 allows remote authenticated users to execute JavaScript in victims' browsers via saved URLs. The rules() method in app/Http/Requests/Models/Api/BulkStoreLinksRequest.php marks models.*.url only as required, so the bulk API stores javascript: URIs that resources/views/models/links/partials/show/link-details.blade.php later emits verbatim in href attributes. Any user who can create links and obtain an API token can plant the payload, and exploitation requires a victim to click the rendered link; the published impact is cookie theft and actions under the victim session.

CVSS severity7.3
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Kovah LinkAce before 2.5.7 allows remote authenticated users to execute JavaScript in victims' browsers via saved URLs. The rules() method in app/Http/Requests/Models/Api/BulkStoreLinksRequest.php marks models.*.url only as required, so the bulk API stores javascript: URIs that resources/views/models/links/partials/show/link-details.blade.php later emits verbatim in href attributes. Any user who can create links and obtain an API token can plant the payload, and exploitation requires a victim to click the rendered link; the published impact is cookie theft and actions under the victim session.

The record

CVE
CVE-2026-49436
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
Kovah
Product
LinkAce
Classifications
CWE-79, T1189, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=< 2.5.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kovah · LinkAceversion=< 2.5.7

Published CVSS scores

7.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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