CVE-2026-50876Public exploitNetwork attack vector

Stored XSS via rendered webhook responses

Published Jun 15, 2026 · Updated Jun 15, 2026

Stored cross-site scripting in Deck9 Input 2.0.1 allows remote authenticated users to execute script through a webhook response body. CallWebhookJob stores an untrusted response body, and FormSessionWebhookResource exposes it to a frontend status component that renders it as HTML rather than inert text. Exploitation requires control of a configured webhook endpoint and user interaction by an authenticated user who opens the affected submission status, allowing script access to that user's session and same-origin data.

CVSS severity5.4
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Deck9 Input 2.0.1 allows remote authenticated users to execute script through a webhook response body. CallWebhookJob stores an untrusted response body, and FormSessionWebhookResource exposes it to a frontend status component that renders it as HTML rather than inert text. Exploitation requires control of a configured webhook endpoint and user interaction by an authenticated user who opens the affected submission status, allowing script access to that user's session and same-origin data.

The record

CVE
CVE-2026-50876
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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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