CVE-2025-59543
Stored XSS in Chamilo course descriptions enables session theft and admin account takeover.
Is CVE-2025-59543 being exploited?
Not confirmed. CVE-2025-59543 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.25% probability of exploitation in the next 30 days.
How severe is CVE-2025-59543?
CVE-2025-59543 is rated Critical with a CVSS score of 9.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-59543?
Yes. A fix has been recorded for CVE-2025-59543. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-59543 affect?
CVE-2025-59543 affects Chamilo LMS <1.11.34. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-59543?
Upgrade to 1.11.34+; rotate tokens and validate sessions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Exfiltrate session cookies/tokens and hijack higher-privilege accounts via injected JavaScript.
Immediate action required
- affected< 1.11.34
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.