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CVE-2018-15133

Laravel Deserialization of Untrusted Data

8.1 HIGHActively exploited (CISA KEV)Public exploitEPSS 76.8%
  1. Published9 Aug 2018
  2. Added to CISA KEV16 Jan 2024
  3. Remediation due6 Feb 2024
Actively exploited (CISA KEV)

Laravel Framework contains a deserialization of untrusted data vulnerability, allowing for remote command execution. This vulnerability may only be exploited if a malicious user has accessed the application encryption key (APP_KEY environment variable).

Added to KEV: 16 Jan 2024Federal remediation due: 6 Feb 2024

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Laravel≥ 5.6.0 ≤ 5.6.29 · ≤ 5.5.40

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2018-15133 being actively exploited?

Yes. CVE-2018-15133 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 16 Jan 2024.

How severe is CVE-2018-15133?

CVE-2018-15133 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 76.8% probability of exploitation.

Which products are affected by CVE-2018-15133?

Affected products include Laravel.

How do I fix CVE-2018-15133?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2018-15133 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.