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pkp-lib CVE-2026-76572

| EUVDEUVD-2026-62724 MEDIUM
Improper Restriction of XML External Entity Reference (CWE-611)
2026-08-19 VulDB GHSA-8j8f-r97j-fp5x
PHP XXE Pkp Lib
5.1
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.7 MEDIUM

Network-reachable but gated by high-privilege authentication; XXE yields partial local file disclosure and potential SSRF, warranting Low across C/I/A with no scope change.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Aug 19, 2026 - 20:57 vuln.today
Analysis Generated
Aug 19, 2026 - 20:57 vuln.today

DescriptionCVE.org

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.

AnalysisAI

XML External Entity (XXE) injection in the XSLTransformer component of pkp-lib - the shared PHP library underlying Open Journal Systems, Open Monograph Press, and Open Preprint Systems - allows high-privileged authenticated users to force server-side external entity resolution during XSLT processing, enabling local file disclosure and potential server-side request forgery. Affected branches span all three actively maintained release lines (3.3.x, 3.4.x, 3.5.x) with vendor-released patches confirmed for each. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as high-privilege platform admin
Delivery
Supply crafted XML with external entity declaration
Exploit
Invoke XSLT transformation via administrative workflow
Execution
DOMDocument resolves external entity reference via libxml2
Impact
Exfiltrate local file contents or probe internal network via transformation output
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid high-privilege authenticated session (CVSS PR:H), specifically a journal manager or site administrator account within the PKP platform. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N) scores 5.1, with partial and symmetric impacts across confidentiality, integrity, and availability (VC:L/VI:L/VA:L) and no subsequent-system impact (SC:N/SI:N/SA:N). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A journal manager or site administrator with a valid high-privilege session uploads or supplies a crafted XML document containing a malicious external entity declaration - for example, referencing `file:///etc/passwd` or an internal network endpoint - through an administrative metadata import or XSLT processing interface. The `_transformPHP` function passes this document to DOMDocument with entity resolution enabled, causing libxml2 to fetch and inline the referenced resource, which surfaces in the XSLT transformation output returned to the attacker. …
Remediation Upgrade pkp-lib to version 3.3.0-23, 3.4.0-11, or 3.5.0-5 corresponding to the installed branch; the upstream patch is commit 78c699370ea43ae2784e1c4ace7c947d207f2b47 and the 3.5.0-5 release tag is available at https://github.com/pkp/pkp-lib/releases/tag/3_5_0-5. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-76572 vulnerability details – vuln.today
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