# CVE-2026-33741: EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript

> Authenticated attackers can execute arbitrary JavaScript in victims' browsers by uploading malicious SVG and JS attachments, potentially leading to account takeover.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 May 2026
- **Updated:** 20 May 2026
- **Also known as:** GHSA-5wh5-ccv2-m3pv

## What is CVE-2026-33741?

CVE-2026-33741 is a medium-severity cross-site scripting vulnerability in espocrm, published on 19 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below allow authenticated users to upload SVG attachments through normal attachment-capable fields and later serve those SVG files as top-level inline documents through both the attachment and image entry points, resulting in stored cross-user XSS reachable through a normal attachment workflow. Although inline SVG script is blocked by the response CSP, the same CSP still allows same-origin external script. As a result, an attacker can upload a malicious SVG together with a second attacker-controlled JavaScript attachment, then trick another user into opening the SVG to execute JavaScript in the victim's EspoCRM origin. This issue has been fixed in version 9.3.4.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-33741?


## How do I fix CVE-2026-33741?

No fix has been published for CVE-2026-33741 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33741 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33741 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33741 and fix it if it is affected.

What it is: CVE-2026-33741 is a medium-severity cross-site scripting vulnerability in espocrm, published on 19 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33741 exists.

Affected product: espocrm. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-33741/ (Markdown: https://insights.sbomify.com/CVE-2026-33741/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33741
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33741
- OSV: https://osv.dev/vulnerability/CVE-2026-33741

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33741/
Summaries are generated and may contain mistakes; the official description above is the record.