CVE-2026-56285

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-06-29. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
8.6EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.6Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP responses from any host reachable by the server, including cloud metadata services and internal network resources.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
70
EG Risk 70/100

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
Severity86% × 45%
Exploitation40% × 40%
Automatability100% × 15%
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

Published

June 29, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jun 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Nitter - Server-Side Request Forgery in /video Media Proxy Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint
github_commit

commit 44b2f096f67d (zedeus/nitter)

Fix landed in zedeus/nitter commit 44b2f096f67d — awaiting tagged release

https://github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47
generic

SSRF via /video proxy endpoint with well-known default HMAC key · Issue #1411 · zedeus/nitter · GitHub

https://github.com/zedeus/nitter/issues/1411

Vendor Advisories for CVE-2026-56285(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 34× 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 244 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-56285?
CVE-2026-56285 is a high vulnerability published on June 29, 2026. Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP responses from any host reachable by the server, including…
When was CVE-2026-56285 disclosed?
CVE-2026-56285 was first published on June 29, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56285 actively exploited?
CVE-2026-56285 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56285?
CVE-2026-56285 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56285?
An upstream fix for CVE-2026-56285 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-56285 are linked in the Vendor Advisories panel on this page.

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