EUVD-2026-62183
GHSA-w5c5-88rv-x3v2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
Staff login required (PR:L), victim must view suggestions page (UI:R), scope changes as scripts run in other users' browsers (S:C), with limited session/action exposure (C:L/I:L).
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
2DescriptionCVE.org
Koha before 26.05.02, 25.11.07, and 25.05.13 contains a stored cross-site scripting vulnerability in the purchase suggestion handler that allows authenticated staff users to inject malicious scripts by submitting unsanitized input through the suggestion save operation. Attackers can supply crafted HTML or script content in fields such as title, author, isbn, publishercode, place, collectiontitle, itemtype, and note, which are stored without sanitization and later rendered in the suggestion list template, causing injected scripts to execute in the browser of any staff user who views the suggestions.
AnalysisAI
Stored cross-site scripting in Koha's purchase suggestion handler allows any authenticated staff user to inject persistent malicious scripts into multiple unsanitized input fields, which then execute in the browsers of other staff users who view the suggestion list. Affected versions span three active release branches: 25.05.x before 25.05.13, 25.11.x before 25.11.07, and 26.05.x before 26.05.02, all of which have now received patched releases. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a valid Koha staff account with permission to submit purchase suggestions - this is a standard low-privilege staff role, not an administrative one. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 correctly captures the moderate but bounded risk. … 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 | Upgrade to the patched release corresponding to your active branch: Koha 25.05.13, 25.11.07, or 26.05.02. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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