CVE-2021-32670Network attack vector

Protected-data access via unescaped trace JSON

Published Jun 7, 2021 · Updated Aug 3, 2024

Reflected XSS in Datasette before 0.56.1 allows remote attackers to run script in a user's browser through a crafted trace request. The ?_trace=1 debugging path embeds its generated JSON in an HTML response without correctly escaping attacker-controlled content. Exploitation requires a user to open the crafted URL; script running in the Datasette origin can access protected data when authentication plugins are installed.

CVSS severity6.1
Medium
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Datasette before 0.56.1 allows remote attackers to run script in a user's browser through a crafted trace request. The ?_trace=1 debugging path embeds its generated JSON in an HTML response without correctly escaping attacker-controlled content. Exploitation requires a user to open the crafted URL; script running in the Datasette origin can access protected data when authentication plugins are installed.

The record

CVE
CVE-2021-32670
Published
Jun 7, 2021
Updated
Aug 3, 2024
Vendor
Simon Willison
Product
Datasette
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=< 0.56.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Simon Willison · Datasetteversion=< 0.56.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
7.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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