CVE-2026-121627
buku 5.0 through 5.1.1 Stored XSS via bukuserver Bookmark List URL
buku 5.0 through 5.1.1 contains a stored cross-site scripting vulnerability in the bukuserver bookmark list that allows attackers to execute script via an unescaped bookmark URL in BookmarkModelView._list_entry(). Attackers can submit a URL containing a double quote and event handler through the unauthenticated /api/bookmarks endpoint to issue same-origin API requests with viewers' credentials.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| buku jarun buku
pypi |
≥ 5.0; ≤ 5.1.1 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | CNA: VulnCheck |
| 3.1 / 6.1 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | CNA: VulnCheck |
| 4.0 / 5.3 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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 | NVD: [email protected] |
| 3.1 / 6.1 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/jarun/buku/issues/911CNA: VulnCheck · issue-tracking
- https://github.com/jarun/buku/blob/v5.1.1/bukuserver/views.py#L133CNA: VulnCheck · technical-description
- https://github.com/jarun/bukuCNA: VulnCheck · product
- https://www.vulncheck.com/advisories/buku-5.0-through-5.1.1-stored-xss-via-bukuserver-bookmark-list-urlCNA: VulnCheck · third-party-advisory
- https://github.com/jarun/buku[email protected]
- https://github.com/jarun/buku/blob/v5.1.1/bukuserver/views.py#L133[email protected]
- https://github.com/jarun/buku/issues/911[email protected]
- https://www.vulncheck.com/advisories/buku-5.0-through-5.1.1-stored-xss-via-bukuserver-bookmark-list-url[email protected]
For agents and automation
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Endpoints and access details
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