Piwigo - Information Disclosure (CVE-2026-27833)

CVE-2026-27833 is an information disclosure vulnerability in Piwigo, where the pwg.history.search API method allows unauthenticated users to access the complete browsing history of all gallery visitors. This flaw exposes sensitive user activity data, potentially enabling attackers to track user behavior and compromise privacy. The issue is resolved in Piwigo version 16.3.0.

CrowdSec has been tracking this vulnerability and its exploits since 24th of June 2026.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2026-27833 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. In addition, according to the CrowdSec network, attack volume against CVE-2026-27833 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.

Attackers exploit unauthenticated requests to the /ws.php?method=pwg.history.search endpoint to retrieve sensitive browsing history data from Piwigo installations prior to version 16.3.0.