CVE-2026-53575 espocrm CVE debrief

Who should care

Defenders managing EspoCRM instances, especially those with administrative access, should assess exposure and apply the patch. Defenders should prioritize verifying exposure and applying the patch for EspoCRM instances, especially those with administrative access. They should also restrict administrative access to the applicationName setting to reduce risk and monitor user sessions for suspicious activity to detect potential attacks.

Why it matters

CVE-2026-53575 is a persistent XSS vulnerability in EspoCRM that allows an authenticated administrator to inject malicious content, potentially leading to data leakage. Defenders should prioritize verifying exposure and applying the patch.

• Verify exposure and apply patch to prevent exploitation
• Restrict administrative access to the applicationName setting to reduce risk
• Monitor user sessions for suspicious activity to detect potential attacks

Technical summary

The vulnerability allows an authenticated administrator to inject crafted content in the applicationName setting through CSP nonce injection. The persistent injection is inserted into the main application page without escaping, allowing attacker-controlled JavaScript to run in users' sessions and leak page data, including unsaved user input. This issue is fixed in version 9.3.9. The vulnerability allows an authenticated administrator to inject crafted content in the applicationName setting through CSP nonce injection. The persistent injection is inserted into the main application page without escaping, allowing attacker-controlled JavaScript to run in users' sessions and leak page data, including unsaved user

Defensive priority

Defenders should prioritize verifying exposure and applying the patch for EspoCRM instances, especially those with administrative access.

Recommended defensive actions

• Verify EspoCRM version and apply patch to 9.3.9 if vulnerable
• Restrict administrative access to the applicationName setting
• Monitor user sessions for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, its impact, and the fixed version. The vulnerability allows an authenticated administrator to inject crafted content in the applicationName setting through CSP nonce injection. The persistent injection is inserted into the main application page without escaping, allowing attacker-controlled JavaScript to run in users' sessions and leak page data, including unsaved user input. Defenders should verify exposure and apply the patch for EspoCRM instances, review 9

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.