Is CVE-2026-39901 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-39901 being exploited in the wild.

How severe is CVE-2026-39901?

Medium severity, with a CVSS score of 5.7, published 8 April 2026.

Which products and versions are affected?

github.com/monetr/monetr (Go) <= 1.12.2, SEMVER:introduced=0,fixed=1.12.3; Monetr < 1.12.3, <= 1.12.2.

Is there a fix for CVE-2026-39901?

Yes. github.com/monetr/monetr (Go): upgrade to 1.12.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-39901 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-39901?

Check whether you run github.com/monetr/monetr (Go) or Monetr 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.

CVE-2026-39901: monetr improper authorization in transaction update endpoint

Q: Is there a fix for CVE-2026-39901?

Yes. github.com/monetr/monetr (Go): upgrade to 1.12.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-39901 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-39901?

Check whether you run github.com/monetr/monetr (Go) or Monetr 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.

CVE-2026-39901 · Severity: medium · CVSS 5.7 · Published 2026-04-08

monetr is a budgeting application used to track and plan recurring expenses. A flaw in the software allows users to bypass restrictions and hide or 'soft-delete' imported financial transactions that are supposed to be permanent. This can lead to inaccurate financial records, compromised bookkeeping integrity, and the loss of a reliable audit trail for synced expenses.

Technologies: github.com/monetr/monetr (Go). Vendors: Go.

Quick answers

Is CVE-2026-39901 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-39901 being exploited in the wild.
How severe is CVE-2026-39901?: Medium severity, with a CVSS score of 5.7, published 8 April 2026.
Which products and versions are affected?: github.com/monetr/monetr (Go) <= 1.12.2, SEMVER:introduced=0,fixed=1.12.3; Monetr < 1.12.3, <= 1.12.2.
Is there a fix for CVE-2026-39901?: Yes. github.com/monetr/monetr (Go): upgrade to 1.12.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-39901 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-39901?: Check whether you run github.com/monetr/monetr (Go) or Monetr 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

github.com/monetr/monetr (Go): upgrade to 1.12.3 or later
```
go get github.com/monetr/monetr@v1.12.3
```

Technical details

The vulnerability is an improper authorization and integrity flaw (CWE-285) within the transaction update (PUT) path. While the application correctly blocks the deletion of synced transactions via the dedicated DELETE handler, the PUT endpoint fails to filter server-managed fields. An authenticated attacker can submit a full Transaction object containing a user-supplied 'deletedAt' value. The server persists this field, effectively soft-deleting the record and hiding it from standard views. This bypasses the immutability policy intended for imported transaction records. The issue is resolved in version 1.12.3.

Affected products

monetr monetr < 1.12.3

Identifiers

CVE-2026-39901
GHSA-hqxq-hwqf-wg83
GO-2026-5434

Timeline

2026-04-07: advisory: GitHub Security Advisory published
2026-04-08: disclosed: CVE-2026-39901 published
2026-04-08: patched: Fix released in version 1.12.3

References

https://github.com/monetr/monetr/security/advisories/GHSA-hqxq-hwqf-wg83

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