Vulnerability in Appwrite
CVE-2026-89036
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- Release Tag (release-notes)
- Pull Request (issue-tracking, patch)
- Patch Commit (patch)
- www.vulncheck.com/advisories/appwrite-argument-injection-via-providerrootdirect… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-89036?
- CVE-2026-89036 is a high-severity vulnerability in Appwrite, classified under Argument Injection. CVSS score: 8.8/10. Published 2026-09-17.
- How severe is CVE-2026-89036?
- High severity. CVSS v3 base score is 8.8 out of 10.