TI-2026-49907 Aliases CVE-2026-71236 GHSA-c924-wcfj-cr8j

Grocy - Stored XSS via HTMLPurifier Output Double-Decode

MEDIUM 40CWE-79Published 2026-08-05 · Updated 2026-08-10

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Grocy's API request-body parser (controllers/Api/BaseApiController.php, GetParsedAndFilteredRequestBody) purifies incoming field values with HTMLPurifier, then manually reverses HTML-entity encoding of the resulting output by replacing &lt;, &gt;, and &amp; back to <, >, and & immediately after purification.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00353 29th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
grocy	grocy	all versions	—	No fix listed	CNA

grocy Vendorgrocy Affected all versions Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-71236
2026-10-03 Alias added: GHSA-c924-wcfj-cr8j

References

Advisory 1

https://github.com/grocy/grocy

TI-2020-12025 Stored XSS in Grocy CVSS 3.1HIGH 7.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences