Auth bypass in Pkp Open Journal Systems
CVE-2026-111609
PKP Open Journal Systems through 3.5.0-5 contains an insecure direct object reference vulnerability that allows journal or subscription managers to access other journals' subscriptions by supplying arbitrary subscription ids. Attackers can enumerate sequential ids through editSubscription to view subscriber details and use updateSubscription to reassign subscriptions to their own journal, revoking victims' access.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/ojs-subscription-form-cross-journal-idor (third-party-advisory)
- github.com/pkp/ojs/blob/3_5_0-5/controllers/grid/subscriptions/IndividualSubscr… (technical-description)
- github.com/pkp/ojs/blob/3_5_0-5/controllers/grid/subscriptions/InstitutionalSub… (technical-description)
- www.vulncheck.com/advisories/pkp-open-journal-systems-through-3.5.0-5-cross-jou… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111609?
- CVE-2026-111609 is a low-severity vulnerability in Pkp Open Journal Systems, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 3.8/10. Published 2026-10-16.
- How severe is CVE-2026-111609?
- Low severity. CVSS v3 base score is 3.8 out of 10.