CVE-2026-70617

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Spacebar Server before commit dcfd910 contains a missing authorization vulnerability that allows any authenticated attacker to add themselves to arbitrary group DM channels by sending a PUT request to the channels recipient endpoint without membership verification. Attackers can exploit the unguarded PUT /channels/{channel_id}/recipients/{user_id} handler to join private group DMs, read complete message history, post messages as a participant, and force-add third-party users without their consent.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100CISA SSVC

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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

September 16, 2026

Advisory Details (3)

Auto-updated Aug 5, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic

Spacebar Server Missing Authorization via Group DM Recipient Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/spacebar-server-missing-authorization-via-group-dm-recipient-endpoint
github_commit

commit dcfd91035e3d (spacebarchat/server)

Fix landed in spacebarchat/server commit dcfd91035e3d — awaiting tagged release

https://github.com/spacebarchat/server/commit/dcfd91035e3da42abf5f32d8d86a35219225b3d4
github Patch Available🟡 PoC Available

Any authenticated user can join, read, and post in any group DM by id (missing authorization on PUT /channels/{channel_id}/recipients/{user_id}) · Advisory · spacebarchat/server · GitHub

https://github.com/spacebarchat/server/security/advisories/GHSA-g38j-78fh-jm74

Vendor Advisories for CVE-2026-70617(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 90× 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 206 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-70617?
CVE-2026-70617 is a high vulnerability published on August 5, 2026. Spacebar Server before commit dcfd910 contains a missing authorization vulnerability that allows any authenticated attacker to add themselves to arbitrary group DM channels by sending a PUT request to the channels recipient endpoint without membership verification. Attackers can exploit the…
When was CVE-2026-70617 disclosed?
CVE-2026-70617 was first published on August 5, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70617 actively exploited?
CVE-2026-70617 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70617?
CVE-2026-70617 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70617?
A fix for CVE-2026-70617 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70617 are linked in the Vendor Advisories panel on this page.

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