CVE-2023-50252Public exploitNetwork attack vector

Code execution via unvalidated use-element href merge

Published Dec 12, 2023 · Updated Aug 2, 2024

PHAR deserialization in php-svg-lib before 0.5.1 allows remote attackers to execute code via crafted SVG input on PHP before 8. UseTag::handle merges an unvalidated use-element href into a referenced image, bypassing prior image URL checks before file_get_contents loads the resulting PHAR URL. Reachability requires an application to render attacker-controlled SVG data under PHP before 8; available gadget classes determine whether file deletion or code execution follows.

CVSS severity8.3
High
EPSS probability23.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHAR deserialization in php-svg-lib before 0.5.1 allows remote attackers to execute code via crafted SVG input on PHP before 8. UseTag::handle merges an unvalidated use-element href into a referenced image, bypassing prior image URL checks before file_get_contents loads the resulting PHAR URL. Reachability requires an application to render attacker-controlled SVG data under PHP before 8; available gadget classes determine whether file deletion or code execution follows.

The record

CVE
CVE-2023-50252
Published
Dec 12, 2023
Updated
Aug 2, 2024
Vendor
dompdf
Product
php-svg-lib
Classifications
CWE-502, CWE-15
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

dompdf · php-svg-libversion=< 0.5.1

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CWE-15External Control of System or Configuration Setting

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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