CVE-2026-86174

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-05. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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

Plane through 1.4.2 fails to validate that issues belong to the deploy board's project in the public comment endpoint. Authenticated attackers can post comments to arbitrary issues across workspaces by supplying an issue_id parameter to the public deploy-board comment endpoint.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 16, 2026

Advisory Details (4)

Auto-updated Sep 5, 2026
No patch confirmed yet.
generic

Plane through 1.4.2 Arbitrary Comment Write via Public Deploy Board | Advisories | VulnCheck

https://www.vulncheck.com/advisories/plane-through-1.4.2-arbitrary-comment-write-via-public-deploy-board
generic

cross-tenant comment-injection IDOR in the public deploy-board comment endpoint · Issue #9441 · makeplane/plane · GitHub

https://github.com/makeplane/plane/issues/9441
generic

plane/apps/api/plane/space/views/issue.py at v1.4.2 · makeplane/plane · GitHub

https://github.com/makeplane/plane/blob/v1.4.2/apps/api/plane/space/views/issue.py#L258-L275
generic

GitHub - makeplane/plane: 🔥🔥🔥 Open-source Jira, Linear, Monday, and ClickUp alternative. Plane is a modern project management platform to manage tasks, sprints, docs, and triage. · GitHub

https://github.com/makeplane/plane

Vendor Advisories for CVE-2026-86174(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 22× in last 7d / 47× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 11:54 UTCEG score recompute
  3. 2026-09-20 11:54 UTCGHSA enrichment
  4. 2026-09-19 12:02 UTCEG score recompute
  5. 2026-09-19 12:02 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 12:36 UTCEG score recompute
  8. 2026-09-18 12:36 UTCGHSA enrichment
  9. 2026-09-17 19:32 UTCEPSS rescore
  10. 2026-09-17 13:11 UTCEG score recompute
  11. 2026-09-17 13:11 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 13:45 UTCGHSA enrichment
  14. 2026-09-16 13:16 UTCEG score recompute
  15. 2026-09-16 13:15 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-15 13:45 UTCEG score recompute
  18. 2026-09-15 13:45 UTCGHSA enrichment
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-14 14:20 UTCEG score recompute
  22. 2026-09-14 14:20 UTCGHSA enrichment
  23. 2026-09-13 14:54 UTCGHSA enrichment
  24. 2026-09-12 15:16 UTCEG score recompute
  25. 2026-09-12 15:16 UTCGHSA enrichment
Show 22 more
  1. 2026-09-11 15:51 UTCEG score recompute
  2. 2026-09-11 15:51 UTCGHSA enrichment
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-10 16:25 UTCEG score recompute
  6. 2026-09-10 16:25 UTCGHSA enrichment
  7. 2026-09-10 15:27 UTCEG score recompute
  8. 2026-09-10 15:27 UTCGHSA enrichment
  9. 2026-09-10 08:49 UTCGHSA enrichment
  10. 2026-09-09 09:23 UTCEG score recompute
  11. 2026-09-09 09:23 UTCGHSA enrichment
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-08 09:58 UTCEG score recompute
  14. 2026-09-08 09:58 UTCGHSA enrichment
  15. 2026-09-07 10:14 UTCEG score recompute
  16. 2026-09-07 10:14 UTCGHSA enrichment
  17. 2026-09-06 13:48 UTCEPSS rescore
  18. 2026-09-06 10:47 UTCEG score recompute
  19. 2026-09-06 10:47 UTCGHSA enrichment
  20. 2026-09-05 11:22 UTCEG score recompute
  21. 2026-09-05 11:03 UTCEG score recompute
  22. 2026-09-05 11:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86174?
CVE-2026-86174 is a medium vulnerability published on September 5, 2026. Plane through 1.4.2 fails to validate that issues belong to the deploy board's project in the public comment endpoint. Authenticated attackers can post comments to arbitrary issues across workspaces by supplying an issue_id parameter to the public deploy-board comment endpoint.
When was CVE-2026-86174 disclosed?
CVE-2026-86174 was first published in the National Vulnerability Database on September 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-2026-86174 actively exploited?
CVE-2026-86174 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 90.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86174?
CVE-2026-86174 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-86174?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86174, 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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