CVE-2026-6256Network attack vector

Stored XSS via unescaped shortcode link attribute

Published May 12, 2026 · Updated May 12, 2026

Stored XSS in Jash Jacob Credits Shortcode & Block 1.2 and earlier allows remote authenticated users to inject scripts via the link attribute. The credits shortcode handler places the user-supplied link attribute into generated page markup without sufficient input sanitization or output escaping, causing the payload to persist with the post. Contributor-level access is required, and the script executes in the browser of any user who views the injected page.

CVSS severity6.4
Medium
EPSS probability0.19%
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 Jash Jacob Credits Shortcode & Block 1.2 and earlier allows remote authenticated users to inject scripts via the link attribute. The credits shortcode handler places the user-supplied link attribute into generated page markup without sufficient input sanitization or output escaping, causing the payload to persist with the post. Contributor-level access is required, and the script executes in the browser of any user who views the injected page.

The record

CVE
CVE-2026-6256
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Jash Jacob
Product
Credits Shortcode & Block
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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 <=1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jash Jacob · Credits Shortcode & Blockversion=0 <=1.2

Published CVSS scores

6.4GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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 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')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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