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Vulnerability record · CVE-2023-23924 · published 1 February 2023

CVE-2023-23924: Dompdf project dompdf incorrect authorization vulnerability

Dompdf Project · Dompdf

Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing `<image>` tags with uppercase letters. This may lead to arbitrary object unserialize on PHP < 8, through the `phar` URL wrapper. An attacker can exploit the vulnerability to call arbitrary URL with arbitrary protocols, if they can provide a SVG file to dompdf. In PHP versions before 8.0.0, it leads to arbitrary unserialize, that will lead to the very least to an arbitrary file deletion and even remote code execution, depending on classes that are available.

9.8 CVSS 3.1 Critical EPSS 3.6% · top 11.0% CWE-551 · CWE-551CWE-863 · Incorrect authorization
9.8CVSS 3.1 base score
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing `<image>` tags with uppercase letters. This may lead to arbitrary object unserialize on PHP < 8, through the `phar` URL wrapper. An attacker can exploit the vulnerability to call arbitrary URL with arbitrary protocols, if they can provide a SVG file to dompdf. In PHP versions before 8.0.0, it leads to arbitrary unserialize, that will lead to the very least to an arbitrary file deletion and even remote code execution, depending on classes that are available.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/dompdf/dompdf/commit/7558f07f693b2ac3266089f21051e6b78c6a0c85 PatchThird Party Advisory
https://github.com/dompdf/dompdf/releases/tag/v2.0.2 Release NotesThird Party Advisory
https://github.com/dompdf/dompdf/security/advisories/GHSA-3cw5-7cxw-v5qg ExploitThird Party Advisory
https://github.com/dompdf/dompdf/commit/7558f07f693b2ac3266089f21051e6b78c6a0c85 PatchThird Party Advisory
https://github.com/dompdf/dompdf/releases/tag/v2.0.2 Release NotesThird Party Advisory
https://github.com/dompdf/dompdf/security/advisories/GHSA-3cw5-7cxw-v5qg ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-23924), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.