CVE-2021-25028Public exploitNetwork attack vector

Off-site user redirection via unvalidated return URL

Published Jan 24, 2022 · Updated Aug 3, 2024

Open redirect in The Events Calendar Event Tickets before 5.2.2 allows remote attackers to redirect users through a crafted URL. The RSVP form route copies the unvalidated tribe_tickets_redirect_to query value into an HTTP Location response. No authentication is required, but a victim must follow the crafted link; the resulting off-site navigation can support phishing without directly altering site data.

CVSS severity6.1
Medium
EPSS probability1.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in The Events Calendar Event Tickets before 5.2.2 allows remote attackers to redirect users through a crafted URL. The RSVP form route copies the unvalidated tribe_tickets_redirect_to query value into an HTTP Location response. No authentication is required, but a victim must follow the crafted link; the resulting off-site navigation can support phishing without directly altering site data.

The record

CVE
CVE-2021-25028
Published
Jan 24, 2022
Updated
Aug 3, 2024
Vendor
The Events Calendar
Product
Event Tickets
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 24, 2022CVE 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=5.2.2 <5.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Events Calendar · Event Ticketsversion=5.2.2 <5.2.2

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.8NVDAV:N/AC:M/Au:N/C:P/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 exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Malicious Link

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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