CVE-2026-48780

Summary

Forem is open source software for building communities. Prior to commit a2ab6d4, a maliciously crafted email address could allow an attacker to bypass domain allowlist or denylist restrictions and gain access to invite-only forem deployments. The issue is patched as of a2ab6d4. As a workaround, some SMTP servers and email delivery providers may drop or refuse to send maliciously crafted email addresses.

Affected Software

Weaknesses

• CWE-287: CWE-287: Improper Authentication

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/forem/forem/security/advisories/GHSA-3g4h-9h37-mpx6
• https://github.com/forem/forem/commit/a2ab6d409d2676eb0711ecbd737192043125b437

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