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pkp-lib CVE-2026-19906

| EUVDEUVD-2026-59789 MEDIUM
Use of Insufficiently Random Values (CWE-330)
2026-08-15 cna@vuldb.com GHSA-gccx-9qmf-hrf5
PHP Information Disclosure
6.3
CVSS 4.0 · Vendor: vuldb
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Severity by source

Vendor (vuldb) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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
3.7 LOW

Network-reachable brute-force with no auth required by attacker, but high complexity to narrow timestamp window; only confidentiality impact (API key disclosure).

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

Primary rating from Vendor (vuldb).

CVSS VectorVendor: vuldb

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Aug 15, 2026 - 19:31 vuln.today
Analysis Generated
Aug 15, 2026 - 19:31 vuln.today

DescriptionCVE.org

A weakness has been identified in pkp pkp-lib 3.3.0/3.4.0/3.5.0. This vulnerability affects the function setData of the file classes/user/form/APIProfileForm.php of the component API Key Generation. Executing a manipulation of the argument apiKey can lead to insufficient entropy. The attack may be performed from remote. This attack is characterized by high complexity. It is stated that the exploitability is difficult. This patch is called 529b5df878e571ccc727647f7748eafc1466b041. It is best practice to apply a patch to resolve this issue.

AnalysisAI

Insufficient entropy in API key generation for pkp/pkp-lib 3.3.0, 3.4.0, and 3.5.0 exposes generated API keys to brute-force prediction. The vulnerable code derived API keys using SHA1 of the current Unix timestamp (sha1(time())), which yields a deterministic, low-entropy value easily narrowed to a small candidate window if the approximate key-generation time is known or guessable. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that a target user has generated an API key via the API Profile Form (API key generation must be enabled in the PKP platform configuration, as it is not always on by default). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:H/AT:N/PR:N/UI:N/VC:L) scores 6.3, reflecting that while exploitation is network-reachable, the high attack complexity (AC:H) accounts for the brute-force effort required to narrow the timestamp window. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the upstream fix available at commit 529b5df878e571ccc727647f7748eafc1466b041 (https://github.com/pkp/pkp-lib/commit/529b5df878e571ccc727647f7748eafc1466b041). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-19906 vulnerability details – vuln.today
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