CVE-2024-58353Public exploitNetwork attack vectorHinoki check available

Stored XSS via unsanitized booking-question labels

Published Jul 23, 2026 · Updated Jul 23, 2026

Stored XSS in Cal.diy 4.7.15 and earlier allows remote authenticated users to execute JavaScript when a victim opens a booking URL. The single booking view passes attacker-controlled booking-question labels to React's dangerouslySetInnerHTML without sanitizing or escaping them. Creating an event type is required; open registration exposes the path to remote attackers, while victims must open the crafted URL.

CVSS severity9.3
Critical
EPSS probability0.41%
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.diy 4.7.15 and earlier allows remote authenticated users to execute JavaScript when a victim opens a booking URL. The single booking view passes attacker-controlled booking-question labels to React's dangerouslySetInnerHTML without sanitizing or escaping them. Creating an event type is required; open registration exposes the path to remote attackers, while victims must open the crafted URL.

The record

CVE
CVE-2024-58353
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
Cal.com, Inc.
Product
Cal.diy
Classifications
CWE-80, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 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 <=4.7.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cal.com, Inc. · Cal.diyversion=0 <=4.7.15

Published CVSS scores

8.9VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
8.9GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L

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 exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1189Drive-by Compromise

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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