Critical severity9.8NVD Advisory· Published Jan 18, 2021· Updated Jun 17, 2026
CVE-2021-25294
CVE-2021-25294
Description
OpenCATS through 0.9.5-3 unsafely deserializes index.php?m=activity requests, leading to remote code execution. This occurs because lib/DataGrid.php calls unserialize for the parametersactivity:ActivityDataGrid parameter. The PHP object injection exploit chain can leverage an __destruct magic method in guzzlehttp.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- OpenCATS/OpenCATSdescription
Patches
Vulnerability mechanics
References
3- github.com/snoopysecurity/snoopysecurity.github.io/blob/master/web-application-security/2021/01/16/09_opencats_php_object_injection.htmlnvdPatchThird Party Advisory
- snoopysecurity.github.io/web-application-security/2021/01/16/09_opencats_php_object_injection.htmlnvdExploitThird Party Advisory
- www.opencats.org/news/nvdVendor Advisory
News mentions
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