CVE-2023-37919Network attack vector

Continued account access via unexpired pre-2FA sessions

Published Jul 25, 2023 · Updated Oct 16, 2024

Insufficient session expiration in Cal.com 3.1.4 and earlier allows remote authenticated users to retain account access after 2FA activation. The 2FA activation flow leaves other existing authenticated sessions valid instead of invalidating them and requiring identity verification. An account must already be signed in on at least two devices; a session on another device then continues without completing the newly enabled second factor.

CVSS severity6.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in Cal.com 3.1.4 and earlier allows remote authenticated users to retain account access after 2FA activation. The 2FA activation flow leaves other existing authenticated sessions valid instead of invalidating them and requiring identity verification. An account must already be signed in on at least two devices; a session on another device then continues without completing the newly enabled second factor.

The record

CVE
CVE-2023-37919
Published
Jul 25, 2023
Updated
Oct 16, 2024
Vendor
Cal.com, Inc.
Product
Cal.com
Classifications
CWE-613, T1550.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 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 <=3.1.4
  2. Affected versionversion=<= 3.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cal.com, Inc. · Cal.comversion=0 <=3.1.4; version=<= 3.1.4

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

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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