CVE-2026-71236Network attack vector

Stored XSS via purifier output double-decode

Published Aug 5, 2026 · Updated Aug 5, 2026

Stored XSS in Grocy's API request-body parser allows remote authenticated users to persist executable markup through API-writable fields. GetParsedAndFilteredRequestBody passes each scalar through HTMLPurifier, then decodes entities in the purified output, rebuilding tags that purification encoded. A low-privileged API key or session can plant the payload, but another user must view an affected value for script execution in that user's browser.

CVSS severity8.7
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Grocy's API request-body parser allows remote authenticated users to persist executable markup through API-writable fields. GetParsedAndFilteredRequestBody passes each scalar through HTMLPurifier, then decodes entities in the purified output, rebuilding tags that purification encoded. A low-privileged API key or session can plant the payload, but another user must view an affected value for script execution in that user's browser.

The record

CVE
CVE-2026-71236
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Grocy
Product
Grocy
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grocy · Grocyversion=0

Published CVSS scores

8.7TuranSecCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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.

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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')
T1059.007JavaScript/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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