XXE in Pkp Pkp-Lib
CVE-2026-76572
A vulnerability was detected in pkp pkp-lib up to 3.3.0-22/3.4.0-10/3.5.0-4. The affected element is the function _transformPHP of the file classes/xslt/XSLTransformer.php. The manipulation results in xml external entity reference. The attack can be executed remotely. Upgrading to version 3.3.0-23, 3.4.0-11 and 3.5.0-5 is sufficient to fix this issue. The patch is identified as 78c699370ea43ae2784e1c4ace7c947d207f2b47. Upgrading the affected component is advised.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (37.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001
Affected products
- Pkp Pkp-Lib — versions 3.3.0-22, 3.4.0-10, 3.5.0-4
Weakness classification (CWE)
References
- vuldb.com/vuln/393037 (technical-description, vdb-entry)
- vuldb.com/vuln/393037/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-76572 (third-party-advisory)
- vuldb.com/submit/878359 (third-party-advisory)
- github.com/pkp/pkp-lib/issues/12977 (issue-tracking)
- github.com/pkp/pkp-lib/commit/78c699370ea43ae2784e1c4ace7c947d207f2b47 (patch)
- github.com/pkp/pkp-lib/releases/tag/3_5_0-5 (patch)
- github.com/pkp/pkp-lib/ (product)
Frequently asked questions
- What is CVE-2026-76572?
- CVE-2026-76572 is a medium-severity vulnerability in Pkp Pkp-Lib, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 4.7/10. Published 2026-08-19.
- How severe is CVE-2026-76572?
- Medium severity. CVSS v3 base score is 4.7 out of 10.