CVE-2026-88898

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-10. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

AppFlowy-Cloud versions 0.7.2 through 0.9.64 fail to authorize callers against the workspace in the bulk publish endpoint path, allowing authenticated users to publish content into other tenants' namespaces. Attackers can write published views with attacker-controlled title, body and metadata into victim workspaces to deface public pages or host phishing content on trusted URLs.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 10, 2026

Advisory Details (5)

Auto-updated Sep 10, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

AppFlowy-Cloud 0.7.2 through 0.9.64 Missing Workspace Authorization on Bulk Publish Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/appflowy-cloud-0.7.2-through-0.9.64-missing-workspace-authorization-on-bulk-publish-endpoint
generic

AppFlowy-Cloud/src/api/workspace.rs at 0.9.64 · AppFlowy-IO/AppFlowy-Cloud · GitHub

https://github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/api/workspace.rs
generic

AppFlowy-Cloud/src/biz/workspace/publish.rs at 0.9.64 · AppFlowy-IO/AppFlowy-Cloud · GitHub

https://github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/biz/workspace/publish.rs
generic

GitHub - AppFlowy-IO/AppFlowy-Cloud: Bring projects, wikis, and teams together with AI. AppFlowy is the AI collaborative workspace where you achieve more without losing control of your data. The leading open source Notion alternative. · GitHub

https://github.com/AppFlowy-IO/AppFlowy-Cloud
generic🟡 PoC Available

AppFlowy-Cloud: bulk publish endpoint performs no workspace authorization (CWE-862, >= 0.7.2, unfixed at the final commit) · GitHub

https://gist.github.com/mtholmquist/ab550712a4628c7c7c4705bceccd93b3

Vendor Advisories for CVE-2026-88898(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 / 45× 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. 2026-09-24 16:09 UTCEG score recompute
  2. 2026-09-24 16:09 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-23 14:20 UTCEG score recompute
  6. 2026-09-23 14:19 UTCGHSA enrichment
  7. 2026-09-22 16:01 UTCEPSS rescore
  8. 2026-09-22 12:29 UTCEG score recompute
  9. 2026-09-22 12:29 UTCGHSA enrichment
  10. 2026-09-21 21:09 UTCEPSS rescore
  11. 2026-09-21 10:40 UTCEG score recompute
  12. 2026-09-21 10:40 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 08:50 UTCEG score recompute
  15. 2026-09-20 08:50 UTCGHSA enrichment
  16. 2026-09-19 07:00 UTCEG score recompute
  17. 2026-09-19 07:00 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 05:10 UTCEG score recompute
  20. 2026-09-18 05:10 UTCGHSA enrichment
  21. 2026-09-17 19:32 UTCEPSS rescore
  22. 2026-09-17 03:20 UTCEG score recompute
  23. 2026-09-17 03:20 UTCGHSA enrichment
  24. 2026-09-16 14:09 UTCEPSS rescore
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 20 more
  1. 2026-09-16 01:31 UTCEG score recompute
  2. 2026-09-16 01:31 UTCGHSA enrichment
  3. 2026-09-15 03:12 UTCEPSS rescore
  4. 2026-09-14 23:41 UTCGHSA enrichment
  5. 2026-09-13 21:51 UTCEG score recompute
  6. 2026-09-13 21:51 UTCGHSA enrichment
  7. 2026-09-13 16:48 UTCEPSS rescore
  8. 2026-09-12 20:01 UTCEG score recompute
  9. 2026-09-12 20:01 UTCGHSA enrichment
  10. 2026-09-12 15:02 UTCEPSS rescore
  11. 2026-09-11 18:11 UTCEG score recompute
  12. 2026-09-11 18:11 UTCGHSA enrichment
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-10 16:21 UTCGHSA enrichment
  16. 2026-09-10 15:57 UTCEG score recompute
  17. 2026-09-10 15:57 UTCGHSA enrichment
  18. 2026-09-10 15:20 UTCEG score recompute
  19. 2026-09-10 14:50 UTCEG score recompute
  20. 2026-09-10 14:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88898?
CVE-2026-88898 is a medium vulnerability published on September 10, 2026. AppFlowy-Cloud versions 0.7.2 through 0.9.64 fail to authorize callers against the workspace in the bulk publish endpoint path, allowing authenticated users to publish content into other tenants' namespaces. Attackers can write published views with attacker-controlled title, body and metadata into…
When was CVE-2026-88898 disclosed?
CVE-2026-88898 was first published in the National Vulnerability Database on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88898 actively exploited?
CVE-2026-88898 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 69.9% of all scored CVEs.
What is the CVSS score of CVE-2026-88898?
CVE-2026-88898 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-88898?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88898, 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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