CVE-2026-70617

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH 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%CVSS: 8.1Exploit: Elevated riskExposed: 0

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

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
8.1(high)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 6, 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 30× in last 7d / 64× 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. 2026-08-20 18:22 UTCGHSA enrichment
  2. 2026-08-20 06:37 UTCGHSA enrichment
  3. 2026-08-19 18:52 UTCEG score recompute
  4. 2026-08-19 18:52 UTCGHSA enrichment
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-19 06:47 UTCGHSA enrichment
  7. 2026-08-18 19:00 UTCEG score recompute
  8. 2026-08-18 19:00 UTCGHSA enrichment
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-18 07:15 UTCGHSA enrichment
  12. 2026-08-17 19:30 UTCEG score recompute
  13. 2026-08-17 19:30 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 05:52 UTCGHSA enrichment
  16. 2026-08-16 18:08 UTCEG score recompute
  17. 2026-08-16 18:08 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 06:23 UTCEG score recompute
  21. 2026-08-16 06:23 UTCGHSA enrichment
  22. 2026-08-16 02:15 UTCEPSS rescore
  23. 2026-08-15 18:39 UTCGHSA enrichment
  24. 2026-08-15 06:54 UTCEG score recompute
  25. 2026-08-15 06:54 UTCGHSA enrichment
Show 39 more
  1. 2026-08-15 01:31 UTCEPSS rescore
  2. 2026-08-14 18:32 UTCGHSA enrichment
  3. 2026-08-14 06:48 UTCEG score recompute
  4. 2026-08-14 06:48 UTCGHSA enrichment
  5. 2026-08-13 22:00 UTCEPSS rescore
  6. 2026-08-13 19:03 UTCGHSA enrichment
  7. 2026-08-13 07:18 UTCGHSA enrichment
  8. 2026-08-12 19:33 UTCEG score recompute
  9. 2026-08-12 19:33 UTCGHSA enrichment
  10. 2026-08-12 13:51 UTCEPSS rescore
  11. 2026-08-12 07:48 UTCGHSA enrichment
  12. 2026-08-11 20:03 UTCEG score recompute
  13. 2026-08-11 20:03 UTCGHSA enrichment
  14. 2026-08-11 08:18 UTCEG score recompute
  15. 2026-08-11 08:18 UTCGHSA enrichment
  16. 2026-08-11 00:00 UTCEPSS rescore
  17. 2026-08-10 20:33 UTCGHSA enrichment
  18. 2026-08-10 08:48 UTCGHSA enrichment
  19. 2026-08-09 21:04 UTCEG score recompute
  20. 2026-08-09 21:04 UTCGHSA enrichment
  21. 2026-08-09 13:47 UTCEPSS rescore
  22. 2026-08-09 09:19 UTCGHSA enrichment
  23. 2026-08-08 21:35 UTCEG score recompute
  24. 2026-08-08 21:35 UTCGHSA enrichment
  25. 2026-08-08 16:37 UTCEPSS rescore
  26. 2026-08-08 09:50 UTCGHSA enrichment
  27. 2026-08-07 22:06 UTCEG score recompute
  28. 2026-08-07 22:06 UTCGHSA enrichment
  29. 2026-08-07 10:21 UTCGHSA enrichment
  30. 2026-08-06 22:37 UTCEG score recompute
  31. 2026-08-06 22:37 UTCGHSA enrichment
  32. 2026-08-06 20:02 UTCEG score recompute
  33. 2026-08-06 20:02 UTCGHSA enrichment
  34. 2026-08-06 13:47 UTCEPSS rescore
  35. 2026-08-06 08:17 UTCEG score recompute
  36. 2026-08-06 08:17 UTCGHSA enrichment
  37. 2026-08-05 20:32 UTCEG score recompute
  38. 2026-08-05 20:15 UTCEG score recompute
  39. 2026-08-05 20:15 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 5, 2026, with the most recent update on August 6, 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% probability of exploitation in the next 30 days, which ranks it in the top 85.8% of all scored CVEs.
What is the CVSS score of CVE-2026-70617?
CVE-2026-70617 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-70617?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70617, 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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