How severe is CVE-2026-35404?

CVE-2026-35404 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-35404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35404?

CVE-2026-35404 affects Openedx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35404?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35404 have an EU (EUVD) identifier?

Yes. CVE-2026-35404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19502.

When was CVE-2026-35404 published?

CVE-2026-35404 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-35404

CVE-2026-35404 is a medium-severity vulnerability in Openedx with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19502
Weakness: CWE-601
Affected product: Openedx
Published: 2026-04-06
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-35404?: 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.
How severe is CVE-2026-35404?: CVE-2026-35404 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-35404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35404?: CVE-2026-35404 affects Openedx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35404?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35404 have an EU (EUVD) identifier?: Yes. CVE-2026-35404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19502.
When was CVE-2026-35404 published?: CVE-2026-35404 was published on 2026-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openedx:openedx:*:*:*:*:*:*:*:*

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