CVE-2026-71236

8.7 HIGHpublic exploit available

Published 2026-08-05 · Updated 2026-08-10

AI risk analysis

Summary: The flaw lies in the manual reversal of HTML entity encoding after purification with HTMLPurifier, potentially allowing for injection of malicious scripts.
Exploitability: Exploitation is moderately hard as it requires precise control over the input, but preconditions include the API being misconfigured to allow untrusted input.
Blast radius: If exploited, this could lead to full remote code execution (RCE) on the server hosting the Grocy instance.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the latest version of Grocy that addresses this issue, specifically version 3.2.0 or later.

rcewebapihtml-injection

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Weaknesses

CWE-79

Public exploit & PoC references

https://github.com/grocy/grocy

References

https://github.com/grocy/grocy

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.