# CVE-2026-87879: Acronis Cyber Protect information disclosure in token validation

Source: https://junglewise.ai/threats/cve-2026-87879-sensitive-information-disclosure-due-to-improper-token-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-87879 · Severity: medium · CVSS 5.9 · Published 2026-10-28

Acronis Cyber Protect is backup and recovery software for enterprise systems. A flaw in how the software validates authentication tokens allows an attacker to disclose sensitive information, potentially exposing backup data or system credentials to unauthorized access.

Technologies: [Acronis Cyber Protect](https://junglewise.ai/threats/technologies/cyber-protect). Vendors: [Acronis](https://junglewise.ai/threats/vendors/acronis).

## Quick answers

**Is CVE-2026-87879 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-87879 being exploited in the wild.

**How severe is CVE-2026-87879?** Medium severity, with a CVSS score of 5.9, published 28 October 2026.

**Which products and versions are affected?** Acronis Cyber Protect 17 before build 42587 (Linux, Windows).

**Is there a fix for CVE-2026-87879?** Yes: fixed in Cyber Protect 17 build 42587 and later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-87879 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-87879?** Check whether you run Acronis Cyber Protect 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 Cyber Protect 17 build 42587 and later

## Affected products

- Acronis Cyber Protect 17 before build 42587 (Linux, Windows)

## Timeline

- 2026-10-28: disclosed

## References

- [https://security-advisory.acronis.com/advisories/SEC-10289](https://security-advisory.acronis.com/advisories/SEC-10289)

## Related threats

- [Acronis Cyber Protect SSL certificate verification bypass](https://junglewise.ai/threats/cve-2026-87880-sensitive-information-disclosure-due-to-missing-ssl-certificate)
- [Acronis Cyber Protect executable stack attribute enabled](https://junglewise.ai/threats/cve-2026-87878-linux-binaries-have-executable-stack-attribute-enabled-the)
- [Acronis Cyber Protect token validation bypass](https://junglewise.ai/threats/cve-2026-87103-sensitive-information-disclosure-and-manipulation-due-to-improper)
- [Acronis Cyber Protect token validation bypass](https://junglewise.ai/threats/cve-2026-87102-sensitive-information-disclosure-and-manipulation-due-to-improper)
- [Acronis Cyber Protect sensitive information disclosure in token validation](https://junglewise.ai/threats/cve-2026-87101-sensitive-information-disclosure-due-to-improper-token-validation)