EUVD-2026-81300
GHSA-4mf4-73j6-mvrw
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
Exploitation depends on developer rendering untrusted URLs through the component (AC:H), stored injection needs an account (PR:L), href execution needs a victim click (UI:R), and XSS crosses into the victim's session context (S:C) with limited C/I impact.
Primary rating from Vendor (https://github.com/djust-org/djust).
CVSS VectorVendor: https://github.com/djust-org/djust
Lifecycle Timeline
5DescriptionCVE.org
Impact
Many djust built-in component template tags (djust.components.templatetags.*) render a developer/user-supplied URL into an href / action attribute, HTML-escaping it with conditional_escape but never validating the URL scheme. HTML escaping prevents attribute breakout but does not neutralize a javascript: URI (which needs no escapable characters), so a URL value of javascript:alert(document.cookie) lands verbatim in <a href="javascript:alert(document.cookie)"> and executes in the victim's session on click.
Affected sinks (executing href/action contexts; not exhaustive): breadcrumb (djust_components.py:1535; _advanced.py:1999,2022), dj_nav link/dropdown/brand (djust_components.py:5632,5779,5807,5830), citation URL (:6936), cookie-consent privacy link (:8240), error-page action (_advanced.py:1728), form action (_forms.py:1239). <img src> sinks are lower risk (javascript: does not execute via img src). No scheme validation exists anywhere in the component tags; a docstring at djust_components.py:781 even acknowledges the javascript: risk without mitigating it.
Severity Medium: XSS in the victim's authenticated session whenever an app renders one of these components with a URL sourced from user-controllable data; for href requires a click, worst case is the stored variant (URL persisted from one user, rendered to another). Conditional on developer usage, hence Medium rather than High.
Reproduced: breadcrumb(items=[{"label":"Home","url":"javascript:alert(document.cookie)"}]) emits <a ... href="javascript:alert(document.cookie)">Home</a>; JaVaScRiPt: case variant also passes; https:// URLs are preserved.
Patches
Add a safe_url() helper that neutralizes non-allowlisted schemes (javascript:, vbscript:, data:) to # while preserving http/https/mailto/tel/relative/anchor URLs, and route every href/action/formaction/xlink:href sink through it (then HTML-escape). Add a regression + an audit_ast/system-check rule flagging un-routed URL-attribute interpolation.
Workarounds
Do not pass user-controllable URLs to the affected built-in component tags; pre-validate URL schemes in application code before binding them to component arguments.
References
Reproducer + finding writeup retained privately by the maintainer.
AnalysisAI
Stored and reflected cross-site scripting in djust (pip package djust) before 1.0.7 allows a javascript: URL supplied through user-controllable data to survive into the href/action attributes of built-in component template tags, executing script in a victim's authenticated browser session when the link is clicked. Only applications that bind untrusted URLs to components such as breadcrumb, dj_nav link/dropdown/brand, citation URL, cookie-consent privacy link, error-page action or form action are affected; default djust output is not exposed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a developer/application to render a user-controllable URL through one of the affected djust built-in component template tags (breadcrumb, dj_nav link/dropdown/brand, citation URL, cookie-consent privacy link, error-page action, or form action) - the vulnerability does not manifest in default djust unless these components are used with untrusted URL input. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | No CVSS vector is provided by NVD or the vendor (input CVSS is N/A), so numeric severity cannot be reconciled against signals - the maintainer self-rates this Medium in the GHSA. … 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 djust to 1.0.7, the vendor-released patch identified for this issue, and confirm after upgrading that the affected component tags route URL attributes through the new safe_url() scheme allowlist (the change is not explicitly itemised in the public v1.0.7 changelog, so verify rather than assume); see the advisory at https://github.com/djust-org/djust/security/advisories/GHSA-4mf4-73j6-mvrw and the release at https://github.com/djust-org/djust/releases/tag/v1.0.7. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
Leaving vuln.today