CVE-2026-54087: EasyAdmin: Stored Cross-Site Scripting (XSS) via uploaded files served inline in FileField and ImageField
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
EasyAdmin is a fast and modern admin generator for Symfony applications. From 5.0.0 until 5.0.13, FileField and ImageField can accept browser-executable uploads while templates/crud/field/file.html.twig links to stored files for inline same-origin rendering without a download attribute or Content-Disposition attachment header. When uploads are stored under the public web root, an attacker with access to an affected form can upload HTML through FileField or SVG through ImageField, and JavaScript executes in an authenticated administrator’s origin when the file is opened from the backend. Exploitation requires a privilege gap between the uploader and viewer. The issue can expose session or CSRF tokens and enable privilege escalation, but does not permit PHP or PHTML code execution because Symfony guessExtension does not produce those stored extensions. This issue is fixed in version 5.0.13.
Description quoted from the CVE record (assigned by GitHub_M, published 2026-09-14).
Weakness: CWE-79: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’); CWE-434: Unrestricted Upload of File with Dangerous Type
How it can be exploited
Exploitable over the network with low attack complexity needing low privileges and a user must take an action. Impact: confidentiality high, integrity low, availability none. CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: partial.
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 8 references on Exploit Observer
Live scores
- EPSS
- 0.004
low predicted chance of attack - VEDAS
- 0.988
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| EasyCorp EasyAdminBundle | version >= 5.0.0, < 5.0.13 | 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-2026-54087 EasyAdmin - Stored XSS via FileField/ImageField Upload. Add them to your Suricata rule set and reload.
Show the rules
# CVE-2026-54087 - EasyAdmin 5.0.0-5.0.12 stored XSS: FileField accepts .html and ImageField
# accepts .svg with no MIME/extension restriction, stored under the public web root and linked
# inline (no attachment disposition), so script runs in a higher-privileged admin's origin.
# Match the EasyAdmin CRUD form multipart upload (crudControllerFqcn in the action URL)
# carrying a browser-executable SVG/HTML file name. Authenticated store -> network-detect only.
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-54087 EasyAdmin - Stored XSS via FileField/ImageField Upload"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"crudControllerFqcn"; fast_pattern; nocase; content:"crudAction"; nocase; http.request_body; content:"filename="; nocase; pcre:"/filename=\x22?[^\x22\r\n]*\.(?:svg|svgz|html|htm|xhtml|shtml|xml)\b/i"; classtype:web-application-attack; reference:cve,CVE-2026-54087; reference:url,https://www.exploit.observer/?keyword=CVE-2026-54087&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=easyadmin&match=exact; sid:1101004; rev:1;)
CVE-2026-54087.rules on GitHub
References
Other references
- https://github.com/EasyCorp/EasyAdminBundle/security/advisories/GHSA-8559-gwj3-q37r (x_refsource_CONFIRM)
- https://github.com/EasyCorp/EasyAdminBundle/commit/8132b2b0ca3876c9261264fa267106a1b2c10a68 (x_refsource_MISC)
- https://github.com/EasyCorp/EasyAdminBundle/releases/tag/v5.0.13 (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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