CVE-2026-1902Public exploitNetwork attack vector

Stored XSS via unescaped apix shortcode attribute

Published Mar 7, 2026 · Updated Mar 7, 2026

Stored XSS in Innovaatik Hammas Calendar 1.5.11 and earlier allows remote authenticated users to inject scripts through the apix shortcode attribute. The HP_Calendar_manage_redirect handler passes apix to HP_Calendar_manage_url, which concatenates the value into a JavaScript URL string without validation or context-appropriate escaping. Contributor-level access is required to save the shortcode in a page, and the script runs in the browser of anyone who visits the injected page.

CVSS severity6.4
Medium
EPSS probability0.20%
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 Innovaatik Hammas Calendar 1.5.11 and earlier allows remote authenticated users to inject scripts through the apix shortcode attribute. The HP_Calendar_manage_redirect handler passes apix to HP_Calendar_manage_url, which concatenates the value into a JavaScript URL string without validation or context-appropriate escaping. Contributor-level access is required to save the shortcode in a page, and the script runs in the browser of anyone who visits the injected page.

The record

CVE
CVE-2026-1902
Published
Mar 7, 2026
Updated
Mar 7, 2026
Vendor
Innovaatik
Product
Hammas Calendar
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 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=* <=1.5.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Innovaatik · Hammas Calendarversion=* <=1.5.11

Published CVSS scores

6.4WordfenceCVSS: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 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')
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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