CVE-2023-49281Network attack vector

Phishing redirection via unvalidated login target

Published Dec 1, 2023 · Updated Aug 2, 2024

Open redirect in Cainor Calendarinho before commit 15b2393 allows remote attackers to send users to external sites through the login flow. CalendarinhoApp.authentication.loginForm passes the user-controlled POST next value directly to HttpResponseRedirect after a successful login without validating its host or scheme. Exploitation requires a user to submit an attacker-crafted login request and authenticate; the resulting redirect supports phishing but does not itself disclose Calendarinho data.

CVSS severity4.7
Medium
EPSS probability0.56%
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 Cainor Calendarinho before commit 15b2393 allows remote attackers to send users to external sites through the login flow. CalendarinhoApp.authentication.loginForm passes the user-controlled POST next value directly to HttpResponseRedirect after a successful login without validating its host or scheme. Exploitation requires a user to submit an attacker-crafted login request and authenticate; the resulting redirect supports phishing but does not itself disclose Calendarinho data.

The record

CVE
CVE-2023-49281
Published
Dec 1, 2023
Updated
Aug 2, 2024
Vendor
Cainor
Product
Calendarinho
Classifications
CWE-601
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=< 15b2393

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cainor · Calendarinhoversion=< 15b2393

Published CVSS scores

4.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
6.1NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')

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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