CVE-2021-24510Network attack vector

Script execution via unescaped event identifier

Published Sep 13, 2021 · Updated Aug 3, 2024

Reflected XSS in Matthew Fries MF Gig Calendar before 1.2 allows remote attackers to execute scripts through a crafted event-editor URL. The admin event editor returns the id GET parameter into its dashboard page without sanitization or output escaping. Exploitation requires an administrator or other authorized event editor to follow the crafted link, exposing that browser session to script actions.

CVSS severity6.1
Medium
EPSS probability2.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Matthew Fries MF Gig Calendar before 1.2 allows remote attackers to execute scripts through a crafted event-editor URL. The admin event editor returns the id GET parameter into its dashboard page without sanitization or output escaping. Exploitation requires an administrator or other authorized event editor to follow the crafted link, exposing that browser session to script actions.

The record

CVE
CVE-2021-24510
Published
Sep 13, 2021
Updated
Aug 3, 2024
Vendor
Matthew Fries
Product
MF Gig Calendar
Classifications
CWE-79, T1204.001, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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 privilegesunauthenticated

What is affected?

Matthew Fries · MF Gig Calendarversion=0 <1.2

Published CVSS scores

6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NISTAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Cross-Site Scripting (XSS)
T1204.001User Execution Malicious Link
T1203Exploitation for Client Execution

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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