CVE-2026-57858Network attack vectorHinoki check available

Stored XSS via unsanitized analytics tracking ID

Published Aug 12, 2026 · Updated Aug 12, 2026

Stored XSS in Cal.com Cal.diy 2.1.1 through 6.2.0 allows remote authenticated users to execute JavaScript on public booking pages. BookingPageTagManager embeds an event owner's unsanitized analytics tracking ID inside an inline script string, so a crafted value closes the literal and supplies executable code. Event ownership is required to persist the payload; every visitor to that event's public page then runs it, exposing sessions and allowing forged requests.

CVSS severityUnavailable
Unscored
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Cal.com Cal.diy 2.1.1 through 6.2.0 allows remote authenticated users to execute JavaScript on public booking pages. BookingPageTagManager embeds an event owner's unsanitized analytics tracking ID inside an inline script string, so a crafted value closes the literal and supplies executable code. Event ownership is required to persist the payload; every visitor to that event's public page then runs it, exposing sessions and allowing forged requests.

The record

CVE
CVE-2026-57858
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Cal.com, Inc.
Product
Cal.diy
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=2.1.1 <=6.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cal.com, Inc. · Cal.diyversion=2.1.1 <=6.2.0

Published CVSS scores

No CVSS assessment is available in this record.

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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