CVE-2025-52131Public exploitNetwork attack vector

Stored XSS via unescaped calendar colors

Published Aug 3, 2025 · Updated Aug 7, 2025

Stored XSS in XWiki Contrib Mocca Calendar Application before 2.15 allows remote authenticated users to execute scripts through color fields. The event modal renders attacker-controlled background or text color values without escaping, so stored markup executes when the event opens. Any user able to create or edit an event can plant the payload, but execution requires a calendar viewer to open the affected event modal.

CVSS severity6.4
Medium
EPSS probability0.24%
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 XWiki Contrib Mocca Calendar Application before 2.15 allows remote authenticated users to execute scripts through color fields. The event modal renders attacker-controlled background or text color values without escaping, so stored markup executes when the event opens. Any user able to create or edit an event can plant the payload, but execution requires a calendar viewer to open the affected event modal.

The record

CVE
CVE-2025-52131
Published
Aug 3, 2025
Updated
Aug 7, 2025
Vendor
XWiki Contrib
Product
Mocca Calendar Application
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2025Record 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 <2.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

XWiki Contrib · Mocca Calendar Applicationversion=0 <2.15

Published CVSS scores

6.4MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
9.0GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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-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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