CVE-2026-8404

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 79% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. django.middleware.cache.UpdateCacheMiddleware in Django does not match Cache-Control response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their Cache-Control directives used uppercase or mixed-case values. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Ahmed Badawe for reporting this issue.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

June 3, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated Jun 14, 2026
No patch confirmed yet.
generic

Django security releases issued: 6.0.6 and 5.2.15 | Weblog | Django

https://www.djangoproject.com/weblog/2026/jun/03/security-releases/
generic
https://groups.google.com/g/django-announce
generic

Archive of security issues | Django documentation | Django

https://docs.djangoproject.com/en/dev/releases/security/

Vendor Advisories for CVE-2026-8404(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
python-django2:2.2.24-1 ... 3:6.1~rc1-1 (184 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
python-django3:3.2.19-1 ... 3:6.1~rc1-1 (108 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
python-django3:4.2.23-1 ... 3:6.1~rc1-1 (63 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-django3:4.2.23-1 ... 3:5.2~rc1-1 (40 versions)3:5.2.15-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
django5.2 ... 6.0.5 (21 versions)6.0.6—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 31× 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.

Showing the most recent 100 of 159 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:32 UTCEPSS rescore
  3. 2026-09-16 14:09 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 05:37 UTCEG score recompute
  7. 2026-09-13 16:48 UTCEPSS rescore
  8. 2026-09-12 23:36 UTCOSV refresh
  9. 2026-09-12 15:02 UTCEPSS rescore
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-08 22:01 UTCEPSS rescore
  12. 2026-09-06 13:48 UTCEPSS rescore
  13. 2026-09-05 15:31 UTCEPSS rescore
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-09-01 04:40 UTCEPSS rescore
  18. 2026-08-30 19:18 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:42 UTCEPSS rescore
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-26 14:47 UTCEPSS rescore
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-25 03:40 UTCEG score recompute
  25. 2026-08-24 14:18 UTCEPSS rescore
Show 75 more
  1. 2026-08-23 13:35 UTCEG score recompute
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-21 08:28 UTCEG score recompute
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-20 10:05 UTCEG score recompute
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-18 13:49 UTCEPSS rescore
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 03:51 UTCEG score recompute
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:17 UTCEG score recompute
  15. 2026-08-16 02:15 UTCEPSS rescore
  16. 2026-08-15 02:49 UTCEG score recompute
  17. 2026-08-15 01:31 UTCEPSS rescore
  18. 2026-08-14 04:44 UTCEG score recompute
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 06:40 UTCEG score recompute
  21. 2026-08-12 13:51 UTCEPSS rescore
  22. 2026-08-12 08:36 UTCEG score recompute
  23. 2026-08-11 13:43 UTCEPSS rescore
  24. 2026-08-11 09:20 UTCEG score recompute
  25. 2026-08-11 00:00 UTCEPSS rescore
  26. 2026-08-10 11:16 UTCEG score recompute
  27. 2026-08-09 13:47 UTCEPSS rescore
  28. 2026-08-09 13:11 UTCEG score recompute
  29. 2026-08-08 16:37 UTCEPSS rescore
  30. 2026-08-07 16:42 UTCEG score recompute
  31. 2026-08-07 16:42 UTCGHSA enrichment
  32. 2026-08-06 18:38 UTCEG score recompute
  33. 2026-08-06 18:38 UTCGHSA enrichment
  34. 2026-08-06 13:47 UTCEPSS rescore
  35. 2026-08-05 20:34 UTCEG score recompute
  36. 2026-08-05 20:34 UTCGHSA enrichment
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-05 19:17 UTCEPSS rescore
  39. 2026-08-04 19:24 UTCEG score recompute
  40. 2026-08-04 19:24 UTCGHSA enrichment
  41. 2026-08-04 15:10 UTCEPSS rescore
  42. 2026-08-04 10:39 UTCEPSS rescore
  43. 2026-08-03 15:43 UTCGHSA enrichment
  44. 2026-08-02 11:19 UTCEG score recompute
  45. 2026-08-02 11:19 UTCGHSA enrichment
  46. 2026-08-02 02:27 UTCEPSS rescore
  47. 2026-08-01 13:07 UTCEG score recompute
  48. 2026-08-01 13:07 UTCGHSA enrichment
  49. 2026-08-01 04:16 UTCEPSS rescore
  50. 2026-07-31 05:32 UTCEG score recompute
  51. 2026-07-31 05:32 UTCGHSA enrichment
  52. 2026-07-30 16:28 UTCEPSS rescore
  53. 2026-07-30 01:30 UTCEPSS rescore
  54. 2026-07-29 10:25 UTCEG score recompute
  55. 2026-07-29 10:25 UTCGHSA enrichment
  56. 2026-07-28 15:37 UTCEPSS rescore
  57. 2026-07-28 03:31 UTCEG score recompute
  58. 2026-07-28 03:30 UTCGHSA enrichment
  59. 2026-07-27 14:14 UTCEPSS rescore
  60. 2026-07-26 22:41 UTCEG score recompute
  61. 2026-07-26 22:41 UTCGHSA enrichment
  62. 2026-07-26 14:54 UTCEPSS rescore
  63. 2026-07-25 14:18 UTCEPSS rescore
  64. 2026-07-24 14:18 UTCEPSS rescore
  65. 2026-07-23 14:18 UTCEPSS rescore
  66. 2026-07-23 03:23 UTCEG score recompute▲ 2.20
  67. 2026-07-22 14:08 UTCEPSS rescore
  68. 2026-07-20 17:08 UTCEPSS rescore
  69. 2026-07-19 14:31 UTCEPSS rescore
  70. 2026-07-18 10:04 UTCEPSS rescore
  71. 2026-07-16 17:03 UTCEPSS rescore
  72. 2026-07-15 16:57 UTCEPSS rescore
  73. 2026-07-15 02:00 UTCEPSS rescore
  74. 2026-07-14 13:04 UTCGHSA enrichment
  75. 2026-07-13 22:31 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-8404?
CVE-2026-8404 is a medium vulnerability published on June 3, 2026. An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. django.middleware.cache.UpdateCacheMiddleware in Django does not match Cache-Control response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their…
When was CVE-2026-8404 disclosed?
CVE-2026-8404 was first published in the National Vulnerability Database on June 3, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8404 actively exploited?
CVE-2026-8404 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 78.8% of all scored CVEs.
What is the CVSS score of CVE-2026-8404?
CVE-2026-8404 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-8404?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8404, 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.

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