How severe is CVE-2018-15133?

CVE-2018-15133 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-15133 being actively exploited?

Yes. CVE-2018-15133 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-01-16, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-15133?

CVE-2018-15133 affects Laravel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-15133?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-15133 have an EU (EUVD) identifier?

Yes. CVE-2018-15133 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-5039. It is also flagged as exploited in the EUVD (since 2024-01-16).

When was CVE-2018-15133 published?

CVE-2018-15133 was published on 2018-08-09 and last updated on 2026-06-17.

CVE-2018-15133

CVE-2018-15133 is a high-severity vulnerability in Laravel with a CVSS 3.x base score of 8.1. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-01-16). The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 77% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2024-01-16)
EU (EUVD) id: EUVD-2022-5039
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-01-16)
Weakness: CWE-502
Affected product: Laravel
Published: 2018-08-09
Last modified: 2026-06-17

Description

In Laravel Framework through 5.5.40 and 5.6.x through 5.6.29, remote code execution might occur as a result of an unserialize call on a potentially untrusted X-XSRF-TOKEN value. This involves the decrypt method in Illuminate/Encryption/Encrypter.php and PendingBroadcast in gadgetchains/Laravel/RCE/3/chain.php in phpggc. The attacker must know the application key, which normally would never occur, but could happen if the attacker previously had privileged access or successfully accomplished a previous attack.

Frequently asked questions

What is CVE-2018-15133?: In Laravel Framework through 5.5.40 and 5.6.x through 5.6.29, remote code execution might occur as a result of an unserialize call on a potentially untrusted X-XSRF-TOKEN value. This involves the decrypt method in Illuminate/Encryption/Encrypter.php and PendingBroadcast in gadgetchains/Laravel/RCE/3/chain.php in phpggc. The attacker must know the application key, which normally would never occur, but could happen if the attacker previously had privileged access or successfully accomplished a previous attack.
How severe is CVE-2018-15133?: CVE-2018-15133 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-15133 being actively exploited?: Yes. CVE-2018-15133 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-01-16, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-15133?: CVE-2018-15133 affects Laravel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-15133?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-15133 have an EU (EUVD) identifier?: Yes. CVE-2018-15133 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-5039. It is also flagged as exploited in the EUVD (since 2024-01-16).
When was CVE-2018-15133 published?: CVE-2018-15133 was published on 2018-08-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:laravel:laravel:*:*:*:*:*:*:*:*

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