CVE-2025-68523Network attack vector

Authenticated event duplication via unbound copy nonce

Published Dec 24, 2025 · Updated Dec 24, 2025

Missing authorization in Spiffy Calendar 5.0.7 and earlier allows remote authenticated users to copy another user's event. The event-copy handler validates a nonce that is not bound to the requested event ID, so a token issued for one event is accepted when copying a different event. Contributor-level access and a valid copy nonce are required, and successful exploitation creates an unauthorized duplicate without broader reported impact.

CVSS severity4.3
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Spiffy Calendar 5.0.7 and earlier allows remote authenticated users to copy another user's event. The event-copy handler validates a nonce that is not bound to the requested event ID, so a token issued for one event is accepted when copying a different event. Contributor-level access and a valid copy nonce are required, and successful exploitation creates an unauthorized duplicate without broader reported impact.

The record

CVE
CVE-2025-68523
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
Spiffy Plugins
Product
Spiffy Calendar
Classifications
CWE-862
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=n/a <=<= 5.0.7 changes=[{"at":"5.0.8","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Spiffy Plugins · Spiffy Calendarversion=n/a <=<= 5.0.7 changes=[{"at":"5.0.8","status":"unaffected"}]

Published CVSS scores

4.3PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

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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