CVE-2026-55421 json
Open edX Platform: SSRF in Studio Video Download Endpoint
published 4mo ago modified 2mo ago also EUVD-2026-70223 , GHSA-fpf9-9rpr-jvrx
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository openedx/openedx-platform. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
Open edX Platform enables the authoring and delivery of online learning at any scale. Prior to commit 00b7c3c, the endpoint accepts user-supplied files[].url, performs a server-side fetch using "requests.get(url, allow_redirects=True)". The fetched bytes are then returned inside a ZIP response. This enables SSRF with response exfiltration. Redirect-following is enabled, and there is no timeout in the vulnerable fetch path. This issue has been patched via commit 00b7c3c.
Patch / fix
Is CVE-2026-55421 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N |
Affected products
- openedx openedx-platform
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
- github.com /openedx/openedx-platform/commit/00b7c3ce418b487c5696b064fc5033594b045e75
- github.com /openedx/openedx-platform/commit/241b914a191ec24658b9cde75a7114db40a5d53a
- github.com /openedx/openedx-platform/commit/c9831c2c9f53b7aa9a61d80e6d91a9941ce52ec6
-
github.com
/openedx/openedx-platform/security/advisories/GHSA-fpf9-9rpr-jvrx
advisory
Sources
- CVE List CVE-2026-55421
- NVD CVE-2026-55421
- Maintainer advisory GHSA-fpf9-9rpr-jvrx
Fencer Intel 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.
The maintainers of openedx/openedx-platform published their own advisory on GitHub. Reviewed sources take precedence over it.