CVE-2025-6975Network attack vector

Reflected XSS via unescaped calendar header

Published Jul 9, 2025 · Updated Apr 8, 2026

Reflected XSS in Marcus Sykes Events Manager through 6.6.4.4 and 7.0.1 through 7.0.3 allows remote attackers to execute scripts. The calendar navigation template outputs the attacker-controlled calendar_header value into page markup without sufficient sanitization or contextual escaping. Exploitation requires an unauthenticated attacker to induce a user to open a crafted link, after which injected script runs in the user's browser.

CVSS severity6.1
Medium
EPSS probability0.26%
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 Marcus Sykes Events Manager through 6.6.4.4 and 7.0.1 through 7.0.3 allows remote attackers to execute scripts. The calendar navigation template outputs the attacker-controlled calendar_header value into page markup without sufficient sanitization or contextual escaping. Exploitation requires an unauthenticated attacker to induce a user to open a crafted link, after which injected script runs in the user's browser.

The record

CVE
CVE-2025-6975
Published
Jul 9, 2025
Updated
Apr 8, 2026
Vendor
Marcus Sykes
Product
Events Manager
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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=0 <=6.6.4.4
  2. Affected versionversion=7.0.1 <=7.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Marcus Sykes · Events Managerversion=0 <=6.6.4.4; version=7.0.1 <=7.0.3

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

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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