# CVE-2026-53981: Cap-go account takeover via insecure email change mechanism

Source: https://junglewise.ai/threats/cve-2026-53981-cap-go-account-takeover-via-insecure-email-change-mechanism  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-12. Updated: 2026-06-12  
License: CC BY 4.0 with a link back

CVE-2026-53981 · Severity: high · CVSS 7.6 · Published 2026-06-12

Cap-go, a platform for managing app updates and backend functions, contains a security flaw in how it handles user email updates. If an attacker gains temporary access to a logged-in user's session (for example, on a shared computer), they can change the account's email address to one they control without needing to provide the current password or multi-factor authentication. This allows the attacker to permanently lock the original owner out and take full control of the account by performing a password reset.

Technologies: [Cap-go](https://junglewise.ai/threats/technologies/cap-go). Vendors: [Cap-go](https://junglewise.ai/threats/vendors/cap-go).

## Quick answers

**Is CVE-2026-53981 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-53981 being exploited in the wild.

**How severe is CVE-2026-53981?** High severity, with a CVSS score of 7.6, published 12 June 2026.

**Which products and versions are affected?** Cap-go < 12.128.2.

**Is there a fix for CVE-2026-53981?** A patch was published on 2026-06-12: Fix released in version 12.128.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-53981 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-53981?** Check whether you run Cap-go 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.

## Technical details

A Missing Authentication for Critical Function (CWE-306) vulnerability exists in Cap-go's email change workflow. The application fails to require re-authentication (password or MFA) or send a confirmation notice to the existing email address when a change is requested. An attacker with access to an active authenticated session can update the account email to an attacker-controlled address, verify the new email via a link sent only to that new address, and then use the password reset functionality to achieve full account takeover. This issue is resolved in version 12.128.2.

## Affected products

- Cap-go Cap-go < 12.128.2

## Timeline

- 2026-02-10: advisory: GitHub Security Advisory published
- 2026-06-12: disclosed: CVE published to NVD
- 2026-06-12: patched: Fix released in version 12.128.2

## References

- [https://github.com/Cap-go/capgo/commit/6685e5f11adef257bf3d085e481f4d8ebcec602e](https://github.com/Cap-go/capgo/commit/6685e5f11adef257bf3d085e481f4d8ebcec602e)
- [https://github.com/Cap-go/capgo/security/advisories/GHSA-w56g-jv78-hf79](https://github.com/Cap-go/capgo/security/advisories/GHSA-w56g-jv78-hf79)
- [https://www.vulncheck.com/advisories/cap-go-account-takeover-via-unauthenticated-email-change-mechanism](https://www.vulncheck.com/advisories/cap-go-account-takeover-via-unauthenticated-email-change-mechanism)