How severe is CVE-2018-1999019?

CVE-2018-1999019 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-1999019 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1999019?

CVE-2018-1999019 primarily affects Chamilo Chamilo Lms. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-1999019?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-1999019 published?

CVE-2018-1999019 was published on 2018-07-23 and last updated on 2026-06-17.

CVE-2018-1999019

CVE-2018-1999019 is a critical-severity vulnerability in Chamilo Chamilo Lms with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Chamilo Chamilo Lms
Published: 2018-07-23
Last modified: 2026-06-17

Description

Chamilo LMS version 11.x contains an Unserialization vulnerability in the "hash" GET parameter for the api endpoint located at /webservices/api/v2.php that can result in Unauthenticated remote code execution. This attack appear to be exploitable via a simple GET request to the api endpoint. This vulnerability appears to have been fixed in After commit 0de84700648f098c1fbf6b807dee28ec640efe62.

Frequently asked questions

What is CVE-2018-1999019?: Chamilo LMS version 11.x contains an Unserialization vulnerability in the "hash" GET parameter for the api endpoint located at /webservices/api/v2.php that can result in Unauthenticated remote code execution. This attack appear to be exploitable via a simple GET request to the api endpoint. This vulnerability appears to have been fixed in After commit 0de84700648f098c1fbf6b807dee28ec640efe62.
How severe is CVE-2018-1999019?: CVE-2018-1999019 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-1999019 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1999019?: CVE-2018-1999019 primarily affects Chamilo Chamilo Lms. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-1999019?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-1999019 published?: CVE-2018-1999019 was published on 2018-07-23 and last updated on 2026-06-17.

References

Affected products (20)

cpe:2.3:a:chamilo:chamilo_lms:1.11.0:-:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:beta1:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:beta2:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:beta3:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:beta4:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:beta5:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:beta6:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:beta7:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.0:rc1:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.2:*:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.4:-:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.4:alpha1:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.4:alpha2:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.4:beta1:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.4:rc1:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.6:-:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.6:alpha1:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.8:-:*:*:*:*:*:*
cpe:2.3:a:chamilo:chamilo_lms:1.11.8:rc1:*:*:*:*:*:*

More vulnerabilities in Chamilo Chamilo Lms

CVE-2026-33698 — Critical (CVSS 9.8): Chamilo LMS is a learning management system. Prior to 1.11.38, a chained attack can enable otherwise-blocked PHP code…
CVE-2026-28430 — Critical (CVSS 9.8): Chamilo LMS is a learning management system. Prior to version 1.11.34, there is an unauthenticated SQL injection…
CVE-2025-52998 — Critical (CVSS 9.8): Chamilo is a learning management system. Prior to version 1.11.30, in the application, deserialization of data is…
CVE-2025-50192 — Critical (CVSS 9.8): Chamilo is a learning management system. Prior to version 1.11.30, there is a time-based SQL Injection in found in…
CVE-2025-50190 — Critical (CVSS 9.8): Chamilo is a learning management system. Prior to version 1.11.30, there is an error-based SQL Injection via the GET…
CVE-2025-50187 — Critical (CVSS 9.8): Chamilo is a learning management system. Prior to version 1.11.28, parameter from SOAP request is evaluated without…

All CVEs affecting Chamilo Chamilo Lms →

Other CWE-94 (Code Injection) vulnerabilities

CVE-2026-57624 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Blocksy Companion Pro <= 2.1.46 versions.
CVE-2026-10134 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 allows an attacker to read every secret available to the Langflow process, read…
CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.

Browse all CWE-94 (Code Injection) vulnerabilities →