# CVE-2026-77738: Synology DiskStation Manager server-side request forgery in Credential API

Source: https://junglewise.ai/threats/cve-2026-77738-a-server-side-request-forgery-vulnerability-in-the-credential-api  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-77738 · Severity: medium · CVSS 4.3 · Published 2026-11-12

Synology DiskStation Manager (DSM) is a network-attached storage operating system used by organizations to manage and access files remotely. A server-side request forgery vulnerability in the Credential API allows authenticated users to read sensitive files from the system. An attacker with valid credentials could gain unauthorized access to confidential data stored on the NAS device.

Technologies: [Synology DiskStation Manager](https://junglewise.ai/threats/technologies/diskstation-manager). Vendors: [Synology](https://junglewise.ai/threats/vendors/synology).

## Quick answers

**Is CVE-2026-77738 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77738 being exploited in the wild.

**How severe is CVE-2026-77738?** Medium severity, with a CVSS score of 4.3, published 12 November 2026.

**Which products and versions are affected?** Synology DiskStation Manager 7.3.2 before 86009-5, 7.4.1 before 90080-1.

**Is there a fix for CVE-2026-77738?** Yes: fixed in DSM 7.3.2-86009-5 or above, DSM 7.4.1-90080-1 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-77738 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-77738?** Check whether you run Synology DiskStation Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in DSM 7.3.2-86009-5 or above, DSM 7.4.1-90080-1 or above

## Technical details

The Credential API in DSM before versions 7.3.2-86009-5 and 7.4.1-90080-1 fails to properly validate server-side requests, allowing authenticated attackers to forge requests and access restricted files. The vulnerability requires valid user authentication and operates over the network without user interaction. Successful exploitation grants file read access beyond the attacker's intended permissions.

## Affected products

- Synology DiskStation Manager 7.3.2 before 86009-5, 7.4.1 before 90080-1

## Timeline

- 2026-11-10: disclosed
- 2026-11-12: advisory

## References

- [https://www.synology.com/en-global/security/advisory/Synology_SA_26_18](https://www.synology.com/en-global/security/advisory/Synology_SA_26_18)

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