CVE-2025-14548Network attack vector

Authenticated stored XSS via unescaped event descriptions

Published Dec 23, 2025 · Updated Dec 23, 2025

Stored XSS in Kieran O'Shea Calendar 1.3.16 and earlier allows remote authenticated users to inject scripts through event_desc. The event submission paths store event_desc without sufficient sanitization, and calendar rendering emits the stored value without contextual escaping. Contributor-level access reaches the flaw only when an administrator permits lower-privilege event management; scripts run when a user opens an affected calendar page.

CVSS severity6.4
Medium
EPSS probability0.23%
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 Kieran O'Shea Calendar 1.3.16 and earlier allows remote authenticated users to inject scripts through event_desc. The event submission paths store event_desc without sufficient sanitization, and calendar rendering emits the stored value without contextual escaping. Contributor-level access reaches the flaw only when an administrator permits lower-privilege event management; scripts run when a user opens an affected calendar page.

The record

CVE
CVE-2025-14548
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
Kieran O'Shea
Product
Calendar
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 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=* <=1.3.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kieran O'Shea · Calendarversion=* <=1.3.16

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 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/JScript

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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