CVE-2026-55421Public exploitNetwork attack vectorHinoki check available

Authenticated internal response exfiltration via unvalidated video URLs

Published Sep 2, 2026 · Updated Sep 2, 2026

SSRF in the Studio video download endpoint in Open edX Platform allows remote authenticated users to read server-fetched HTTP bodies. The handler passes each user-controlled files[].url value to requests.get with redirects enabled, then embeds the returned bytes in a ZIP response without validating the URL against course video records. Studio read access to the target course is required; reachable internal services and cloud metadata can be disclosed, while requests without a timeout can also consume server resources.

CVSS severity6.8
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in the Studio video download endpoint in Open edX Platform allows remote authenticated users to read server-fetched HTTP bodies. The handler passes each user-controlled files[].url value to requests.get with redirects enabled, then embeds the returned bytes in a ZIP response without validating the URL against course video records. Studio read access to the target course is required; reachable internal services and cloud metadata can be disclosed, while requests without a timeout can also consume server resources.

The record

CVE
CVE-2026-55421
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
Open edX
Product
Open edX Platform
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=< 00b7c3ce418b487c5696b064fc5033594b045e75

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open edX · Open edX Platformversion=< 00b7c3ce418b487c5696b064fc5033594b045e75

Published CVSS scores

6.8GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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