Appwrite before 2.0.0 contains an argument injection vulnerability that allows authenticated users with functions.write or sites.write permissions to execute arbitrary commands by injecting TAB characters into the providerRootDirectory parameter used to construct GNU tar commands. The application uses escapeshellcmd instead of escapeshellarg and fails to quote the parameter, allowing TAB characters to survive sanitization and be interpreted as argument separators, enabling injection of arbitrary GNU tar arguments such as --checkpoint-action=exec to achieve remote code execution as the builds worker process user.
CVE-2026-89036
HIGHPre-NVD 8.88.8—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-17. a secondary CVSS source baseline 8.8; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.8
- EG Score
- 8.8(high)
- EG Risk
- 40(Track)EG Risk 40/100SSVC: 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 computedSeverity88% × 45%Exploitation1% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 52%
- KEV
- Not listed
Published
September 17, 2026
Last Modified
September 17, 2026
Advisory Details (4)
Auto-updated Sep 17, 2026Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic
Appwrite < 2.0.0 Argument Injection via providerRootDirectory Parameter | Advisories | VulnCheck
https://www.vulncheck.com/advisories/appwrite-argument-injection-via-providerrootdirectory-parametergithub_commit
commit a82dc6e386a6 (appwrite/appwrite)
Fix landed in appwrite/appwrite commit a82dc6e386a6 — awaiting tagged release
https://github.com/appwrite/appwrite/commit/a82dc6e386a6ac7b88e853a1e6fdb59e0b79ddcagithub_pr
chore: remove the executor build backend
Fix merged in appwrite/appwrite PR #13028 on 2026-07-28 — awaiting tagged release
https://github.com/appwrite/appwrite/pull/13028generic
Releases · appwrite/appwrite · GitHub
https://github.com/appwrite/appwrite/releases#release-2.0.0Vendor Advisories for CVE-2026-89036(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 10× in last 7d / 10× 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.
- 2026-09-19 07:49 UTCEG score recompute
- 2026-09-19 07:49 UTCGHSA enrichment
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-18 19:22 UTCGHSA enrichment
- 2026-09-18 06:54 UTCEG score recompute
- 2026-09-18 06:54 UTCGHSA enrichment
- 2026-09-17 18:26 UTCEG score recompute
- 2026-09-17 17:56 UTCEG score recompute
- 2026-09-17 16:04 UTCEG score recompute
- 2026-09-17 16:04 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-89036?
CVE-2026-89036 is a high vulnerability published on September 17, 2026. Appwrite before 2.0.0 contains an argument injection vulnerability that allows authenticated users with functions.write or sites.write permissions to execute arbitrary commands by injecting TAB characters into the providerRootDirectory parameter used to construct GNU tar commands. The application…
When was CVE-2026-89036 disclosed?
CVE-2026-89036 was first published in the National Vulnerability Database on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89036 actively exploited?
CVE-2026-89036 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.2% of all scored CVEs.
What is the CVSS score of CVE-2026-89036?
CVE-2026-89036 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-89036?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89036, 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
Explore the affected products and dependency analysis for CVE-2026-89036
Is Your Infrastructure Affected by CVE-2026-89036?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.