Citrix StoreFront - XXE (CVE-2019-13608)
Description
Citrix StoreFront Server before 1903, 7.15 LTSR before CU4 (3.12.4000), and 7.6 LTSR before CU8 (3.0.8000) allows XXE attacks.
psychologyCrowdSec Analysis
CVE-2019-13608 is an XML External Entity (XXE) vulnerability in Citrix StoreFront Server versions prior to 1903, 7.15 LTSR before CU4, and 7.6 LTSR before CU8. This flaw could allow remote attackers to exploit XML parsing to access sensitive information from the affected server, potentially leading to data disclosure.
CrowdSec has been tracking this vulnerability and its exploits since 18th of February 2026.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2019-13608 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. In addition, according to the CrowdSec network, attack volume against CVE-2019-13608 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 this vulnerability by sending crafted XML payloads to the /Citrix/StoreAuth/ExplicitForms/Start endpoint, attempting to trigger XML External Entity (XXE) processing on Citrix StoreFront servers.
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| Event | Date |
|---|---|
| CVE Published | 2019-08-29 |
| CISA KEV | 2021-11-03 |
| CISA Remediation Deadline | 2022-05-03 |
| Rule Released | 2026-02-18 |
| CrowdSec First Seen | 2026-02-20 |