# CVE-2026-91982: Vikunja before 2.6.0 TOTP Secret Disclosure via API

> Attackers with valid tokens can read TOTP secrets via API, enabling indefinite second-factor bypass and account takeover in Vikunja.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-88f6-4rjv-x774, GO-2026-6722

## What is CVE-2026-91982?

CVE-2026-91982 is a medium-severity vulnerability in go-vikunja vikunja, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Vikunja before 2.6.0 continues to expose the raw TOTP shared secret after enrollment through the GET /api/v1/user/settings/totp and /api/v1/user/settings/totp/qrcode endpoints without re-authentication. Attackers with a valid access token can read the secret, import it into their own authenticator, and generate valid codes indefinitely to defeat the second factor and enable account takeover.

Weakness: CWE-522 (Insufficiently Protected Credentials)

## Which versions are affected by CVE-2026-91982?

3 open source packages ship an affected version, including code.vikunja.io/api.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `code.vikunja.io/api` | Go | All versions | None |
| `code.vikunja.io/api` | Go | All versions | 2.6.0 |
| `code.vikunja.io/api` | Go | All versions | 2.6.0 |

## How do I fix CVE-2026-91982?

Upgrade code.vikunja.io/api to 2.6.0 or later.

## Is CVE-2026-91982 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91982 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-91982 and fix it if it is affected.

What it is: CVE-2026-91982 is a medium-severity vulnerability in go-vikunja vikunja, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91982 exists.

Affected packages and fixed versions:
- code.vikunja.io/api (Go): affected all versions; no fix listed
- code.vikunja.io/api (Go): affected all versions; fixed in 2.6.0
- code.vikunja.io/api (Go): affected all versions; fixed in 2.6.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-91982/ (Markdown: https://insights.sbomify.com/CVE-2026-91982/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-91982
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-91982
- OSV: https://osv.dev/vulnerability/CVE-2026-91982

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-91982/
Summaries are generated and may contain mistakes; the official description above is the record.