CVE-2026-71503 Dolibarr CVE debrief

Who should care

Defenders responsible for Dolibarr installations, particularly those with administrator accounts, should assess exposure and apply patches or workarounds to prevent exploitation. This includes reviewing system configurations, verifying version numbers, and ensuring Content-Security-Policy headers are implemented. Security teams and vulnerability management teams should prioritize this vulnerability due to its potential impact on administrator sessions and

Why it matters

CVE-2026-71503 is a reflected cross-site scripting vulnerability in Dolibarr before version 24.0.0 that could allow an unauthenticated attacker to execute arbitrary JavaScript in an administrator's session, potentially leading to unauthorized access or account creation. Defenders should prioritize verifying exposure and applying patches or workarounds.

• Potential for arbitrary JavaScript execution in administrator sessions
• Possible creation of persistent administrator accounts
• Risk of unauthorized access to sensitive data or functionality

Technical summary

The vulnerability exists in the extra fields administration template of Dolibarr before version 24.0.0. The type request parameter is echoed without JavaScript-context encoding into an inline script block, allowing an unauthenticated attacker to execute arbitrary JavaScript in an authenticated administrator's session, potentially leading to unauthorized access or account creation. This occurs because no Content-Security-Policy header is emitted, making exploitation possible through crafted URLs that can create persistent administrator accounts.

Defensive priority

Defenders should prioritize verifying exposure and applying patches or workarounds to prevent exploitation.

Recommended defensive actions

• Verify Dolibarr version and apply patch or workaround if necessary
• Implement Content-Security-Policy header to mitigate XSS
• Monitor for suspicious activity and unauthorized administrator accounts
• 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 entry provide details about the vulnerability in Dolibarr before version 24.0.0, but the scope of affected versions and potential impact require further verification by defenders. They should verify the type request parameter is echoed without JavaScript-context encoding into an inline script block and no Content-Security-Policy header is emitted. Evidence is limited to CVE and NVD details; further research may be needed to confirm exploitability and affected deployments.

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.