Is CVE-2023-3823 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 2%.

What products does CVE-2023-3823 affect?

Tracked products affected include PHP. Check the version you run to see whether it is affected.

How do I fix CVE-2023-3823?

Apply the vendor fix promptly. Upgrade affected products to a fixed version.

CVE-2023-3823

Q: What is CVE-2023-3823?

CVE-2023-3823 is a high-severity software vulnerability (XML external entity (XXE)) with a CVSS score of 8.6. In PHP versions 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 various XML functions rely on libxml global state to track configuration variables, like whether external entities are loaded. This state is assumed to be unch

HIGH severity · CVSS 8.6 · XML external entity (XXE)

8.6CVSS HIGH

Summary

In PHP versions 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8 various XML functions rely on libxml global state to track configuration variables, like whether external entities are loaded. This state is assumed to be unchanged unless the user explicitly changes it by calling appropriate function. However, since the state is process-global, other modules - such as ImageMagick - may also use this library within the same process, and change that global state for their internal purposes, and leave it in a state where external entities loading is enabled. This can lead to the situation where external XML is parsed with external entities loaded, which can lead to disclosure of any local files accessible to PHP. This vulnerable state may persist in the same process across many requests, until the process is shut down.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactHigh

Integrity impactLow

Availability impactLow

Exploit probability (EPSS)2%

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Affected products we track (1)

PHP

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

CVE-2023-3823

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information