CVE-2026-55421

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Sep 2, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit c9831c2c9f53 (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit c9831c2c9f53 — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/c9831c2c9f53b7aa9a61d80e6d91a9941ce52ec6
github_commit

commit 241b914a191e (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit 241b914a191e — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/241b914a191ec24658b9cde75a7114db40a5d53a
github_commit

commit 00b7c3ce418b (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit 00b7c3ce418b — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/00b7c3ce418b487c5696b064fc5033594b045e75
github Patch Available🟡 PoC Available

SSRF in Studio Video Download Endpoint · Advisory · openedx/openedx-platform · GitHub

https://github.com/openedx/openedx-platform/security/advisories/GHSA-fpf9-9rpr-jvrx

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-21 00:28 UTCEG score recompute
  2. 2026-09-20 20:16 UTCEPSS rescore
  3. 2026-09-20 00:18 UTCEG score recompute
  4. 2026-09-19 00:08 UTCEG score recompute
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-17 23:57 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescore
  8. 2026-09-16 22:33 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 22:22 UTCEG score recompute
  12. 2026-09-15 03:11 UTCEPSS rescore
  13. 2026-09-13 21:53 UTCEG score recompute
  14. 2026-09-13 16:47 UTCEPSS rescore
  15. 2026-09-12 21:43 UTCEG score recompute
  16. 2026-09-11 21:33 UTCEG score recompute
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-10 21:22 UTCEG score recompute
  19. 2026-09-10 09:35 UTCEPSS rescore
  20. 2026-09-09 04:14 UTCEG score recompute
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-08 04:04 UTCEG score recompute
  23. 2026-09-07 16:01 UTCEPSS rescore
  24. 2026-09-07 03:54 UTCEG score recompute
  25. 2026-09-06 13:47 UTCEPSS rescore
Show 8 more
  1. 2026-09-06 03:43 UTCEG score recompute
  2. 2026-09-05 03:33 UTCEG score recompute
  3. 2026-09-04 05:06 UTCEPSS rescore
  4. 2026-09-04 03:23 UTCEG score recompute
  5. 2026-09-04 02:56 UTCEG score recompute
  6. 2026-09-02 17:35 UTCEG score recompute
  7. 2026-09-02 16:58 UTCEG score recompute
  8. 2026-09-02 16:55 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55421?
CVE-2026-55421 is a medium vulnerability published on September 2, 2026. 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.…
When was CVE-2026-55421 disclosed?
CVE-2026-55421 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55421 actively exploited?
CVE-2026-55421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.4% of all scored CVEs.
What is the CVSS score of CVE-2026-55421?
CVE-2026-55421 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-55421?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55421, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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