CVE-2026-57858 (GCVE-0-2026-57858)
Vulnerability from cvelistv5 – Published: 2026-08-12 12:23 – Updated: 2026-08-12 12:23
VLAI
EPSS
VEX
Title
Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID
Summary
Cal.com Cal.diy versions 2.1.1 through 6.2.0 contain a stored cross-site scripting vulnerability in the BookingPageTagManager component that allows authenticated event owners to inject arbitrary JavaScript by supplying a malicious analytics tracking ID without sanitization. Attackers can close the inline script string literal with a crafted payload that executes in the browser of every visitor to the affected public booking page, enabling session cookie theft, forged authenticated requests, and wormable propagation by chaining with CSRF-able endpoints to persist payloads on additional events.
Severity
8.9 (High)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com | product |
| https://ashtonr.com/blog/cve-2026-57858/ | technical-description |
| https://www.vulncheck.com/advisories/cal-com-cal-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cal.com | Cal.com Self-Hosted (Cal.diy) |
Affected:
2.1.1 , ≤ 6.2.0
(semver)
|
Date Public
2026-08-12 00:00
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"versions": [
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}
],
"metrics": [
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"Recovery": "NOT_DEFINED",
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"problemTypes": [
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"descriptions": [
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"cweId": "CWE-79",
"description": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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"type": "CWE"
}
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],
"providerMetadata": {
"dateUpdated": "2026-08-12T12:23:08.673Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"references": [
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"tags": [
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},
{
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],
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},
{
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}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID",
"x_generator": {
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}
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},
"cveMetadata": {
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"cveId": "CVE-2026-57858",
"datePublished": "2026-08-12T12:23:08.673Z",
"dateReserved": "2026-06-25T18:48:00.282Z",
"dateUpdated": "2026-08-12T12:23:08.673Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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