Open edX Platform has an Open Redirect in Survey Views via Unvalidated redirect_url Parameter

published 2026-04-06 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-19502

cvss: 4.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

Open edX Platform enables the authoring and delivery of online learning at any scale. The view_survey endpoint accepts a redirect_url GET parameter that is passed directly to HttpResponseRedirect() without any URL validation. When a non-existent survey name is provided, the server issues an immediate HTTP 302 redirect to the attacker-controlled URL. Additionally, the same unvalidated URL is embedded in a hidden form field and returned in a JSON response after form submission, where client-side JavaScript performs location.href = url. This enables phishing and credential theft attacks against authenticated Open edX users. This vulnerability is fixed with commit 76462f1e5fa9b37d2621ad7ad19514b403908970.

Patch / fix

links 1

github.com/openedx/openedx-platform@76462f1 commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-04-07)

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/openedx/openedx-platform/security/advisories/GHSA-2843-x998-f8r2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.7	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

openedx openedx-platform

Classification

Weakness

CWE-601 URL Redirection to Untrusted Site

References

github.com /openedx/openedx-platform/commit/76462f1e5fa9b37d2621ad7ad19514b403908970
patch
github.com /openedx/openedx-platform/security/advisories/GHSA-2843-x998-f8r2
exploit, vendor-advisory

Sources

CVE List CVE-2026-35404
NVD CVE-2026-35404

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary