CVE-2026-108264: Wizarr: Authenticated Server-Side Template Injection (SSTI) in wizard step rendering leads to Remote Code Execution (RCE)
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-04 15:41 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
Wizarr is an advanced user invitation and management system for Jellyfin, Plex, Emby, and other media servers. Prior to 2026.9.1, wizard step Markdown supplied through the editor or imported bundles was evaluated by app/blueprints/wizard/routes.py in the application’s non-sandboxed Jinja2 environment with application globals exposed. An authenticated user able to create steps, or an administrator importing an untrusted bundle through POST /settings/wizard/import, could execute arbitrary Python when GET /wizard/{server}/{idx} rendered the stored step; app/jinja_filters.py and app/services/wizard_widgets.py contained additional evaluation sinks. This could execute operating-system commands as the application user, disclose the Flask SECRET_KEY, access connected service credentials and the database, and produce stored cross-site scripting. This issue is fixed in 2026.9.1.
Description quoted from the CVE record (assigned by GitHub_M, published 2026-10-09).
Weakness: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
How it can be exploited
Exploitable over the network with low attack complexity needing high privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA assessment (SSVC): CISA assesses that a public proof of concept exists. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer found 3 code repositories naming this CVE.
Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.
See all 5 references on Exploit Observer
Live scores
- EPSS
- 0.005
low predicted chance of attack - VEDAS
- 0.985
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| wizarrrr wizarr | version < 2026.9.1 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.
How to detect it
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-108264 Wizarr - Authenticated SSTI to RCE via Wizard Step Jinja2 Injection. Add them to your Suricata rule set and reload.
Show the rules
# CVE-2026-108264 - Wizarr < 2026.9.1 evaluates wizard-step Markdown in a non-sandboxed Jinja2
# environment with application globals exposed (app/blueprints/wizard/routes.py); a step created
# via the editor or a bundle imported via POST /settings/wizard/import executes arbitrary Python
# when GET /wizard/{server}/{idx} renders it (authenticated SSTI -> RCE). Detect a wizard
# import/step request carrying a Jinja2 server-side template injection payload.
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-108264 Wizarr - Authenticated SSTI to RCE via Wizard Step Jinja2 Injection"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"wizard"; nocase; fast_pattern; http.request_body; pcre:"/(?:\x7b\x7b|\x7b%|%7b%7b|%7b%25)[^\n]{0,120}(?:__class__|__globals__|__subclasses__|__mro__|__builtins__|__import__|self\.|request\.|config\b|cycler|lipsum|get_flashed_messages|os\.|subprocess|popen|system\s*\x28)/i"; classtype:web-application-attack; reference:cve,CVE-2026-108264; reference:url,https://www.exploit.observer/?keyword=CVE-2026-108264&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=wizarr&match=exact; sid:1101205; rev:1;)
CVE-2026-108264.rules on GitHub
References
Other references
- https://github.com/wizarrrr/wizarr/security/advisories/GHSA-h9rv-mxh2-35f3 (x_refsource_CONFIRM)
- https://github.com/wizarrrr/wizarr/commit/6aa3c33c1b3d945e055ef116cc531028b3735bb7 (x_refsource_MISC)
- https://github.com/wizarrrr/wizarr/releases/tag/v2026.9.1 (x_refsource_MISC)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
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