How severe is CVE-2026-22707?

No CVSS score has been assigned to CVE-2026-22707 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-22707?

CVE-2026-22707 affects the following packages: @strapi/upload (npm). Ecosystems affected: npm.

How do I fix CVE-2026-22707?

Update @strapi/upload to 5.33.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-22707 is resolved across your whole dependency graph.

How do I detect CVE-2026-22707 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @strapi/upload, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-22707 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2026-22707?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-22707 can be triaged on real exposure rather than presence alone.

Is CVE-2026-22707 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-22707 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-22707?

CVE-2026-22707 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 8th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-22707?

CVE-2026-22707 is classified as Unrestricted File Upload (CWE-434), CWE-693 (CWE-693). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-22707 published, and has it been updated?

CVE-2026-22707 was published on May 14, 2026 and was last updated on August 12, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2026-22707 — @strapi/upload

CVE-2026-22707 is a Unrestricted File Upload vulnerability in @strapi/upload. A fix is available for @strapi/upload — see the affected versions and patch details below.

Strapi Upload Plugin MIME Validation Bypass via Content API

Also known asGHSA-pcw7-5633-82vv

Published

May 14, 2026

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 25, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

6other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

@strapi/uploadnpm

155Kdownloads / week

Description

Summary of CVE-2026-22707 Vulnerability Details

CVE: CVE-2026-22707
CVSS v3.1 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N (5.3 — Medium)
Affected Versions: @strapi/upload <=5.33.2
How to Patch: Immediately update your Strapi to >=5.33.3

Description of CVE-2026-22707

In Strapi versions prior to 5.33.3, the Upload plugin's Content API endpoints did not enforce the administrator-configured MIME type restrictions (plugin.upload.security.allowedTypes and deniedTypes). The same restrictions were correctly enforced on the Admin Panel upload path.

The upload plugin's enforceUploadSecurity security check was invoked in the admin upload controller but was missing from the Content API controller. The Content API handlers uploadFiles and replaceFile (and the upload wrapper that dispatches to them) called the underlying upload service directly, bypassing both the magic-byte MIME detection and the configured allow/deny lists.

An authenticated user with the Content API upload permission could therefore upload file types the administrator had explicitly disallowed, including HTML and SVG content. In deployments serving uploaded files from the same origin as the admin panel (default), an attacker could upload an HTML or SVG file that, when opened directly by an admin, executed JavaScript in the admin origin, enabling admin-session hijack and authenticated administrative actions against the admin API.

The patch introduces a shared prepareUploadRequest helper that wraps enforceUploadSecurity and is called from both the Content API and admin upload controllers, ensuring identical security policy enforcement on every upload entry point.

IoC's for CVE-2026-22707

Indicators that an instance running an unpatched version may have been exploited:

Files in /uploads/ with extensions outside the configured allow-list, particularly .html, .htm, .svg, .js, .mjs, .xml, or .xhtml. Filesystem regex: \.(html?|svg|m?js|x?html|xml)$
Successful 201 responses from POST /api/upload where the uploaded file's MIME or extension is outside the configured allowedTypes
Server access logs showing non-administrator users uploading files with executable web content types. Content-Type regex: text/html|application/javascript|image/svg\+xml
Admin browsing logs (X-Forwarded-For, User-Agent) opening files under /uploads/*.html or /uploads/*.svg shortly before unexpected administrative actions (user creation, role changes, permission modifications)

References

CWE-693: Protection Mechanism Failure
CWE-434: Unrestricted Upload of File with Dangerous Type
OWASP: Unrestricted File Upload
Strapi 5 Documentation - Media Library
Strapi Security Policy

Credits

Reported independently by:

@kaminuma (initial report, 2026-01-09)
@arkmarta (concurrent report, 2026-01-13 — originally filed as GHSA-r7hp-523c-r8wr, closed as duplicate)

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`@strapi/upload`	all versions	5.33.3`npm install @strapi/upload@5.33.3`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @strapi/upload, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @strapi/upload to 5.33.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-22707 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-22707 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-22707. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Summary of CVE-2026-22707 Vulnerability Details - CVE: CVE-2026-22707 - CVSS v3.1 Vector: `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N` (5.3 — Medium) - Affected Versions: `@strapi/upload` <=5.33.2 - How to Patch: Immediately update your Strapi to >=5.33.3 ### Description of CVE-2026-22707 In Strapi versions prior to 5.33.3, the Upload plugin's Content API endpoints did not enforce the administrator-configured MIME type restrictions (`plugin.upload.security.allowedTypes` and `deniedTypes`). The same restrictions were correctly enforced on the Admin Panel upload path.

O3 Security · Impact-Aware SCA

Is CVE-2026-22707 in your dependencies?

O3 Security finds CVE-2026-22707 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works